4.2
#include <stdio.h>
#include <string.h>
int main (void)
{
char name[20];
int weidth;
printf("please enter your name: ");
scanf("%s",name);
weidth = strlen(name)+3;
printf("\"%s\"\n",name);
printf("%20s\n",name);
printf("%-20s\n",name);
printf("%*s\n",weidth,name);
return 0 ;
}
4.3
#include <stdio.h>
int main (void)
{
float height;
char name[20];
printf("please enter your name:\n");
scanf("%s",name);
printf("please enter your height:\n");
scanf("%f",&height);
printf("%s ,you are %.3f feet tall",name,height);
return 0 ;
}
4.4
#include <stdio.h>
int main (void)
{
float meter,tall;
char name[20];
printf("please enter your name:\n");
scanf("%s",name);
printf("please enter your height(cm):\n");
scanf("%f",&tall);
meter = tall/100;
printf("%s ,you are %.3f meters tall",name,meter);
return 0 ;
}
4.5
#include <stdio.h>
int main(void)
{
float speed,size,time;
printf("please input the speed(Mb/s): \n");
scanf("%f",&speed);
printf("please enter size of your file(/Mb):\n");
scanf("%f",&size);
time = size*8/speed;
printf("at %.2f megabits per second, a file of"
" %.2f megabytes\n",speed,size);
printf("downloads in %.2f seconds",time);
return 0 ;
}
4.6
#include <stdio.h>
#include <string.h>
int main(void)
{
char first_name[20];
char second_name[20];
int f_length,s_length;
printf("enter your first name: ");
scanf("%s",first_name);
printf("enter your second name:");
scanf("%s",second_name);
f_length = strlen(first_name);
s_length = strlen(second_name);
printf("%s %s\n",first_name,second_name);
printf("%*d %*d\n",f_length,f_length,s_length,s_length);
printf("%-*d %-*d",f_length,f_length,s_length,s_length);
return 0;
}
4.7
#include <stdio.h>
#include <float.h>
int main(void)
{
float f = 1.0/3.0;
double d = 1.0/3.0;
printf("float values: ");
printf("%.6f %.12f %.16f\n",f,f,f);
printf("double values: ");
printf("%.6f %.12f %.16f\n",f,f,f);
printf("FLT_DIG: %d\n",FLT_DIG);
printf("DBL_DIG: %d\n",DBL_DIG);
return 0;
}
5.1
#include <stdio.h>
int main (void)
{
int mins,hour,min;
const int min_translate=60;
printf("please enter minutes and enter <0 to quit \n ");
scanf("%d",&mins);
while (mins>0)
{
hour = mins/min_translate;
min = mins%min_translate;
printf("the time is %02d : %d\n",hour,min);
scanf("%d",&mins);
}
printf("end");
return 0;
}
5.2
#include <stdio.h>
int main (void)
{
int total;
int number=0;
printf("please enter number ");
scanf("%d",&total);
while (number++<=10)
{
printf("%d\n",total++);
}
printf("end");
return 0 ;
}
5.3
#include <stdio.h>
int main (void)
{
int week,day,days;
printf("please enter days: ");
scanf("%d",&days);
while(days>0)
{
week = days/7;
day = days%7;
printf("%d days are %d weeks, %d days",days,week,day);
scanf("%d",&days);
}
return 0;
}
5.4
#include <stdio.h>
int main (void)
{
float cm,inches;
int feet;
printf("enter your height: \n");
scanf("%f",&cm);
while(cm>0)
{
feet = cm/30.48;
inches = ((cm -feet*30.48)/30.48)*12 ;
printf("%.1f cm =%d feet, %.1finches",cm,feet,inches);
scanf("%f",&cm);
}
return 0 ;
}
5.7
#include <stdio.h>
void lifang(double n);
int main (void)
{
double x;
printf("enter a double number:\n");
scanf("%f",&x);
lifang(x);
return 0;
}
void lifang(double n)
{
double number;
number = n*n*n;
printf("the answer is %.1f",number);
}
5.8
#include <stdio.h>
int main (void)
{
int f_number,s_number,modulu;
printf("this problem computes moduli.\n");
printf("Enter an integer to serve as the second operand: ");
scanf("%d",&s_number);
printf("now enter the first operand: ");
scanf("%d",&f_number);
while (f_number>0&s_number>0)
{
modulu = f_number%s_number;
printf("%d %% %d is %d",f_number,s_number,modulu);
printf("enter next number for first operand: \n");
scanf("%d",&f_number);
}
printf("End\n");
return 0;
}
5.9
#include <stdio.h>
void Temperatures(double h_temperature);
int main(void)
{
double temp;
printf("please enter a temperature and quit with a word q :");
while(scanf("%lf",&temp)==1)
{
Temperatures(temp);
printf("please enter another integer: ");
}
printf("done!");
return 0;
}
void Temperatures(double h_temperature)
{
const double a =5.0/9.0,b=32,c=273.16;
printf("three temperature is h is %.2f,s is%.2f ,k is%.2f\n",h_temperature,a*(h_temperature-b),a*(h_temperature-b)+c);
}
6.1
#include <stdio.h>
int main(void)
{
char word[26];
int i;
char ch ='a';
for(i = 0; i < 26; i++)
{
word[i] = ch + i;
printf("%c",word[i]);
}
return 0;
}
6.2
#include <stdio.h>
int main(void)
{
int i, j;
for (i = 0; i<5; i++)
{
for(j=0; j<=i; j++)
printf("$");
printf("\n");
}
return 0;
}
6.3
#include <stdio.h>
int main(void)
{
int i,z;
char j;
for (i = 0; i<6; i++)
{
for(j ='F', z = 0; z<=i; z++, j--)
printf("%c",j);
printf("\n");
}
return 0;
}
6.4
#include <stdio.h>
int main(void)
{
int i,j;
char ch = 'A';
for(i = 0; i<6; i++)
{
for(j = 0; j <= i; j++)
printf("%c",ch++);
printf("\n");
}
return 0;
}
6.5
#include <stdio.h>
int main(void)
{
int i,j,k,x;
char ch;
printf("please enter a word: ");
scanf("%c",&ch);
for(i =0; i < (ch -'A')+1; i++)
{
for(x = 0; x< (ch -'A')-i; x++)
printf("%c",' ');
for(j = 0; j <= i; j++)
printf("%c",'A'+j);
for(k = 1; k <= i; k++)
printf("%c",'A'+j-k-1);
printf("\n");
}
return 0;
}
6.6
#include <stdio.h>
int main(void)
{
int lower, uper;
int i;
printf("please enter the lower number: ");
scanf("%d", &lower);
printf("please enter the uper number: ");
scanf("%d", &uper);
for ( ; lower <= uper; lower++)
{
printf("%d %d %ld\n",lower,lower*lower,lower*lower*lower);
}
}
6.7
#include <stdio.h>
#include <string.h>
int main(void)
{
char word[50];
int i ;
printf("please enter a word: ");
scanf("%s",word);
for( i = strlen(word); i >= 0 ; i--)
{
printf("%c",word[i-1]);
}
return 0;
}
6.8
#include <stdio.h>
int main(void)
{
double x,y;
printf("please enter two number with type of float: ");
while(scanf("%lf %lf", &x, &y) == 2)
{
printf("the result is %f",(x-y)/(x*y));
}
return 0;
}
6.9
#include <stdio.h>
double xx(double x, double y);
int main(void)
{
double i,j;
xx(i,j);
return 0;
}
double xx(double x, double y)
{
printf("please enter two number with type of float: ");
while(scanf("%lf %lf", &x, &y) == 2)
{
printf("the result is %f",(x-y)/(x*y));
}
}
6.10
#include <stdio.h>
int main(void)
{
int lower, upper, sum;
printf("enter lower and upper integer limits: ");
scanf("%d %d", &lower, &upper);
while(lower != upper)
{
for(sum = 0 ; lower <= upper; lower++)
sum += lower*lower;
printf("the sums is %d\n",sum);
printf("enter the next set of limits: ");
scanf("%d %d", &lower, &upper);
}
printf("done!");
return 0;
}
6.11
#include <stdio.h>
int main(void)
{
int i,j,number[10];
printf("please enter the number: ");
for (i = 0; i < 8; i++)
scanf("%d",&number[i]);
for (j = 7; j >= 0; j--)
printf("%d",number[j]);
return 0;
}
6.12
#include <stdio.h>
int main(void)
{
int times,index;
double x,y;
printf("please enter the times: ");
while (scanf("%d",×)==1)
{
for (index = 1, x = 0; index <= times; index++)
x += 1.0/index ;
for (index = 1, y = 0; index <= times; index++)
if (index % 2 == 0)
{
y += -1.0/index;
}
else
y += 1.0/index ;
printf("%lf , %lf", x, y);
printf("please enter the times: \n");
}
return 0;
}
6.13
#include <stdio.h>
#define SIZE 8
int main(void)
{
int i,k,number[SIZE];
for(i = 0, k = 1; i< SIZE; i++)
{
number[i] = k;
k *= 2;
}
i = 0;
do{
printf("%d ",number[i]);
i++;
} while(i < SIZE);
return 0;
}
6.14
#include <stdio.h>
#define SIZE 8
int main(void)
{
double number[SIZE], sums[SIZE];
int i;
double sum;
printf("please enter the integetr: ");
for ( i = 0, sum = 0; i < SIZE; i++)
{
scanf("%lf",&number[i]);
sum += number[i];
sums[i] = sum ;
}
for ( i = 0; i < SIZE; i++)
{
printf("%5.1f ",number[i]);
}
printf("\n");
for ( i = 0; i < SIZE; i++)
{
printf("%5.1f ",sums[i]);
}
return 0;
}
6.15
#include <stdio.h>
#include <string.h>
int main(void)
{
char word[255];
int i=0;
printf("please enter the word you want ro print: ");
scanf("%c",&word[i]);
do{
i++;
scanf("%c",&word[i]);
}while (word[i] != '\n');
for(i = strlen(word); i>=0; i--)
printf("%c",word[i]);
return 0;
}
6.16
#include <stdio.h>
#define Da_interest_rate 0.1
#define De_interest_rate 0.05
int main(void)
{
int year = 0;
double Da_money = 100.0, De_money = 100.0;
do{
year ++;
Da_money += 100*Da_interest_rate;
De_money += De_money*De_interest_rate;
}while(Da_money >= De_money );
printf("after %d years the Deirdre moneys is more than Daphne\n ",year);
printf("and they money are %lf , %lf",De_money,Da_money);
return 0;
}
6.17
#include <stdio.h>
#define interst_rate 0.08
#define take_money 100000
int main(void)
{
double money = 1000000;
int year;
for(year = 0; money >= 0; year++)
{
money += money*interst_rate - take_money;
}
printf("after %d years the count is empty",year);
return 0;
}
6.18
#include <stdio.h>
#define Dunbar_number 150
int main(void)
{
int week,friend_number = 5;
for(week = 0; friend_number <=Dunbar_number; week++)
friend_number = (friend_number-week)*2 -week;
printf("after %d weeks the friends above Dunbar's number",week);
return 0;
}
7.1
#include <stdio.h>
#include <ctype.h>
int main(void)
{
long space = 0L;
long huanhang = 0L;
long others = 0L;
char ch;
while((ch = getchar()) != '#')
{
if (ch == '\n')
huanhang ++;
else if (isspace(ch))
space ++;
else
others ++;
}
printf("%ld %ld %ld", space, huanhang, others);
return 0;
}
7.2
#include <stdio.h>
#define limit 8
int main(void)
{
char ch;
int number = 0;
while((ch = getchar()) !='#')
{
printf("%c-%d ", ch, ch);
number ++;
if (number % limit ==0)
printf("\n");
}
printf("\n");
printf ("done!");
return 0;
}
7.3
#include <stdio.h>
#define limit 8
int main(void)
{
int ch;
int odd_number =0;
int even_number =0;
float odd_average =0.0f;
float even_average =0.0f;
while(scanf("%d",&ch) == 1 && ch !=0)
{
if (ch %2 ==0)
{
even_number++;
even_average += ch;
}
else
{odd_number++;
odd_average += ch;
}
}
printf ("even is %d and the average of them is %.1f",even_number,even_average/even_number);
printf("\n");
printf ("odd is %d and the average of them is %.1lf",odd_number,odd_average/odd_number);
return 0;
}
7.4
#include <stdio.h>
int main(void)
{
char ch;
int i,number =0;
printf("please enter your word: ");
while((ch = getchar()) != '#')
{
if (ch == '.')
{
printf("!");
number++;
}
else if (ch == '!')
{
printf("!!");
number++;
}
else
printf("%c", ch);
}
printf ("\n the number of change are %d",number);
return 0;
}
7.5（注意中英文的感叹号是不同的）
#include <stdio.h>
int main(void)
{
char ch;
int i ;
printf("please enter your word: ");
while((ch = getchar()) != '#')
{
switch(ch)
{
case '.':
printf("!");
break;
case '!':
printf("!!");
break;
default :
printf("%c",ch);
break;
}
}
return 0;
}
7.6
#include <stdio.h>
int main(void)
{
char ch , ched ;
int number = 0;
printf("enter your word : ");
while((ch = getchar()) !='#')
{
if (ched == 'e' && ch =='i')
number++;
ched = ch;
}
printf("the number of ei are %d",number);
return 0;
}
7.7
#include <stdio.h>
#define first_rate 0.15
#define second_rate 0.2
#define last_rate 0.25
#define overtime 1.5
int main(void)
{
double time ,sum_money, money;
printf("please enter the time of this week you have done: ");
scanf("%lf",&time);
if (time > 40)
time = overtime *time;
sum_money = 10.00 * time;
if (sum_money < 300)
money = sum_money-sum_money *first_rate;
else if(sum_money <450)
money = sum_money -300.0*first_rate -(sum_money - 300.0)*second_rate;
else
money = sum_money -300.0*first_rate - 150.0 * second_rate - (sum_money -450.0)*last_rate;
printf("the total money is %.1f and the net income is %.1f",sum_money, money);
return 0;
}
7.8
#include <stdio.h>
#define first_rate 0.15
#define second_rate 0.2
#define last_rate 0.25
#define overtime 1.5
int main(void)
{
double time ,sum_money, money,pay;
int type;
int sign = 1;//标志位用来使得输入不在范围内时，重新进入循环获得case值。
printf("please enter the number of desired pay(1-4): ");
while (scanf("%d",&type) == 1)
{
if (type == 5)
break;
while (sign != 0)
{switch (type)
{
case 1:
pay = 8.75;
sign = 0;
break;
case 2:
pay = 9.33;
sign = 0;
break;
case 3:
pay = 10.00;
sign = 0;
break;
case 4:
pay = 11.20;
sign = 0;
break;
default :
printf("please enter the right number(1-4)");
scanf("%d",&type);
sign = 1;
break ;
}
}
printf("please enter the time of this week you have done: ");
scanf("%lf",&time);
if (time > 40)
time = overtime *time;
sum_money = pay * time;
if (sum_money < 300)
money = sum_money-sum_money *first_rate;
else if(sum_money <450)
money = sum_money -300.0*first_rate -(sum_money - 300.0)*second_rate;
else
money = sum_money -300.0*first_rate - 150.0 * second_rate - (sum_money -450.0)*last_rate;
printf("the total money is %.1f and the net income is %.1f",sum_money, money);
printf("\nplease enter the number of desired pay: \n");
sign = 1;
}
printf("done!");
return 0;
}
7.9
#include <stdio.h>
int main(void)
{
int number,i,j;
int sign = 0;
printf("please enter a number : ");
while (scanf("%d",&number) == 1 && numbe > 0)
{
for ( i=2; i <= number; i++)
{
for (j=2 ; j <= i; j++)
{
if (i % j == 0 && j != i )
{
sign = 1;
break;
}
}
if (sign == 0)
printf("%d \n",i);
sign = 0;
}
printf("please enter a number : ");
}
return 0;
}
7.10
7.11
#include <stdio.h>
#define yangji 2.05
#define beet 1.15
#define carrot 1.09
#define discount 0.05
#define first_rate 6.5
#define second_rate 14
#define third_rate 0.5
int main(void)
{
double pound,n, discount_money, total_money, freight;
char type;
double total_weight = 0.0;
double yangji_weight = 0.0;
double beet_weight = 0.0;
double carrot_weight = 0.0;
printf("please enter the goods you want to (q to quit): ");
while ((type = getchar()) != 'q')
{
if ( type == '\n') //用来跳过输入重量时所按下的Enter键
continue;
while (getchar() !='\n')
continue; // 用来跳过输入行的剩余部分
switch (type)
{
case 'a':
printf("please enter the pound you want to buy: ");
scanf("%lf",&n);
yangji_weight += n;
total_weight += n;
break;
case 'b':
printf("please enter the pound you want to buy: ");
scanf("%lf",&n);
beet_weight += n;
total_weight += n;
break;
case 'c':
printf("please enter the pound you want to buy: ");
scanf("%lf",&n);
carrot_weight += n;
total_weight += n;
break;
}
printf("please enter another goods your want to : ");
}
total_money = yangji * yangji_weight + beet * beet_weight + carrot * carrot_weight;
if (total_money > 100)
discount_money = total_money * discount ;
if (total_weight < 5)
freight = first_rate;
else if (total_weight < 20)
freight = second_rate;
else
freight = second_rate + third_rate*(total_weight - 20.0);
printf("the price of goods are yangji : %.1f beet : %.2f carrot : %.2f \n",yangji, beet, carrot);
printf("your order form are yangji : %.f beet : %.1f carrot : %.1f \n",yangji_weight, beet_weight, carrot_weight);
printf("the total price is %.1f\n",total_money);
printf("the discount is %.1f\n",discount_money);
printf("the freight is %.1f\n",freight);
printf("the finally money is %.3f",total_money + freight - discount_money);
return 0;
}
8.1
#include <stdio.h>
int main(void)
{
int number = 0;
char ch;
printf("please enter the word:");
while((ch = getchar()) != EOF)
{
number++; //用键盘输入时，在输出行的最后一行的开头处 CTRL +Z 来表示文件的结尾，这样就可以使用EOF标志了。
}
printf("end!");
printf("you enter %d ",number);
return 0;
}
8.2
#include <stdio.h>
int main(void)
{
char ch;
int number = 0;
printf("please enter the word you want to print: ");
while((ch = getchar() )!= EOF)
{
switch (ch)
{
case '\n':
printf("\\n");
printf("%d ",ch);
break;
case '\t':
printf("\\t");
printf("%d ",ch);
break;
default:
if(ch < ' ')
{
putchar('^');
putchar(ch+64);
printf(":%d ", ch);
}
else
{
putchar(ch);
printf(":%d ", ch);
break;
}
}
number++;
if(number %10 == 0)
putchar('\n');
}
return 0;
}
8.3
#include <stdio.h>
#include <ctype.h>
int main(void)
{
int upper_number = 0;
int lower_number = 0;
char ch;
printf("please enter words : ");
while ((ch = getchar()) != EOF)
{
if (isupper(ch) != 0)
upper_number++;
else if (islower(ch) != 0)
lower_number++;
}
printf("the alpha you enter have %d upper and %d lower ",upper_number
,lower_number);
return 0;
}
8.4
#include <stdio.h>
#include <ctype.h>
int main(void)
{
int word_number = 0;
int number =0;
int sum_number = 0;
char ch;
printf("please enter word: ");
while((ch = getchar()) != EOF)
{
if ((ch == ' ') || (ch == '\n'))
{
number ++; //字母个数
sum_number += word_number;
word_number = 0;
}
if ((isalpha(ch)) != 0)
{
word_number++;
}
}
printf("these are %d words and have total %d alphas",number,sum_number);
printf("the average of alpha number is %.1f",(float)sum_number/number);
return 0;
}
8.5
#include <stdio.h>
int main(void)
{
int guess = 50;
int upper_limit = 100;
int lower_limit = 0;
char ch;
printf("pick an integer from 1 to 100. i will try to guss");
printf("it .\nRespond with a y if my guss is right and with");
printf("\nan n if it is wrong .\n");
printf("uh... is your number %d?\n",guess);
printf("the number i guss is bigger or smaller than the number( r or b or s )");
while ((ch = getchar()) != 'y')
{
if (ch == '\n')
continue;
if (ch == 'b')
{
upper_limit = guess;
guess = (lower_limit + upper_limit)/2;
}
if(ch == 's')
{
lower_limit = guess;
guess = (lower_limit + upper_limit)/2;
}
if (ch == 'r')
break;
printf("well, then is it %d?\n",guess);
}
printf("i knew i could do it !\n");
return 0;
}
8.6
#include <stdio.h>
char get_first(void);
int main (void)
{
char ch;
printf("please enter a word: ");
ch = get_first();
printf("%c",ch);
return 0;
}
char get_first(void)
{
char ch;
ch = getchar();
while(getchar() != '\n')
continue;
return ch;
}
8.7
#include <stdio.h>
#define first_rate 0.15
#define second_rate 0.2
#define last_rate 0.25
#define overtime 1.5
int main(void)
{
double time ,sum_money, money,pay;
char type;
printf("please enter the number of desired pay(a-d):\n ");
printf("a) $8.75/hr ");
printf("b) $9.33/hr\n");
printf("c) $10.00/hr ");
printf("d) $11.20/hr\n");
printf("q) quit\n");
while (scanf("%c",&type) == 1)
{
if (type == 'q')
break;
switch (type)
{
case 'a': pay = 8.75; break;
case 'b': pay = 9.33; break;
case 'c': pay = 10.00;break;
case 'd': pay = 11.20; break;
default : printf("please enter the right number(a-d)");
continue;
}
printf("please enter the time of this week you have done: ");
scanf("%lf",&time);
if (time > 40)
time = overtime *time;
sum_money = pay * time;
if (sum_money < 300)
money = sum_money-sum_money *first_rate;
else if(sum_money <450)
money = sum_money -300.0*first_rate -(sum_money - 300.0)*second_rate;
else
money = sum_money -300.0*first_rate - 150.0 * second_rate - (sum_money -450.0)*last_rate;
printf("the total money is %.1f and the net income is %.1f",sum_money, money);
printf("\nplease enter the number of desired pay: \n");
}
printf("done!");
return 0;
}
8.8
#include <stdio.h>
char get_choice(void);
int check_first_input (void);
int check_second_input (void);
float add(void);
float subtract(void);
float multiply(void);
float divide(void);
int main(void)
{
char choice;
while ((choice = get_choice()) != 'q')
{
switch(choice)
{
case 'a': add(); break;
case 's': subtract(); break;
case 'm': multiply(); break;
case 'd': divide(); break;
default :printf("please enter the right word.\n");continue;
}
}
printf("done!");
return 0;
}
char get_choice(void)
{
char choice;
printf("Enter the operation of your choice: \n");
printf("a. add s. subtract \n");
printf("m. multiply d. divide\n");
printf("q. quit\n");
choice = getchar();
while(getchar() !='\n')
continue;
return choice;
}
float add(void)
{
float first_number,second_number;
float result;
first_number = check_first_input();
second_number = check_second_input();
result = first_number + second_number;
printf("%.1f + %.1f = %.1f\n",first_number,second_number,result);
return result;
}
float subtract(void)
{
float first_number,second_number;
float result;
first_number = check_first_input();
second_number = check_second_input();
result = first_number - second_number;
printf("%.1f - %.1f = %.1f\n",first_number,second_number,result);
return result;
}
float multiply(void)
{
float first_number,second_number;
float result;
first_number = check_first_input();
second_number = check_second_input();
result = first_number * second_number;
printf("%.1f * %.1f = %.1f\n",first_number,second_number,result);
return result;
}
float divide(void)
{
float first_number,second_number;
float result;
first_number = check_first_input();
second_number = check_second_input();
while (second_number == 0)
{
printf("enter a number other than 0: ");
second_number = check_second_input();
}
result = first_number / second_number;
printf("%.1f / %.1f = %.1f\n",first_number,second_number,result);
return result;
}
int check_first_input (void)
{
int input;
char ch;
printf("please enter the first number: ");
while ((scanf("%d",&input)) == 0)
{
while ((ch = getchar()) != '\n') //这里的getchar（）获得是上次input的值，并不是再从键盘获取新的值
putchar(ch);
printf(" is not an number.\n");
printf("please enter a number,such as 2.5,-1.78E8,or 3 : ");
}
while(getchar() !='\n') //我之前想法是这边的不等于改成等于，但是一旦这样修改那么Enter将会进入while
continue; // 那么这个enter键将被使用而不会将输入送入缓存区。
return input;
}
int check_second_input (void)
{
int input;
char ch;
printf("please enter the second number: ");
while ((scanf("%d",&input)) == 0)
{
while ((ch = getchar()) != '\n')
putchar(ch);
printf(" is not an number.");
printf("please enter a number,such as 2.5,-1.78E8,or 3 :");
}
while(getchar() !='\n')
continue;
return input;
}
9.1
#include <stdio.h>
double min(double x,double y);
int main(void)
{
double x,y,mins;
printf("please enter two number: \n");
scanf("%lf %lf",&x,&y);
mins = min(x,y);
printf("the min number is %.2lf",mins);
return 0;
}
double min (double x , double y)
{
return (x > y)? y:x;
}
9.2.3
#include <stdio.h>
void chline (char ch, int i, int j);
int main (void)
{
char ch;
int i,j;
printf("please enter the word and lines you want to like (a 10 2)\n");
scanf("%c %d %d",&ch,&i,&j);
chline(ch,i,j);
return 0;
}
void chline (char ch, int i, int j)
{
int x,y;
for ( x = 1; x <= j ; x++)
{
for (y = 1 ; y <= i; y++)
putchar(ch);
putchar('\n');
}
return;
}
9.4
#include <stdio.h>
double avg_number(double x,double y);
int main(void)
{
double x,y;
printf("please enter two number (no 0)\n");
scanf("%lf %lf",&x,&y);
printf("the result is %.1f",avg_number(x,y));
return 0;
}
double avg_number(double x,double y)
{
double result;
while((x == 0) || (y == 0))
{
printf("error the number can't be 0 enter agin:");
scanf("%lf %lf",&x,&y);
}
result = 1/((1/x + 1/y)/2);
return result;
}
9.5
#include <stdio.h>
void larger_of (double * x, double * y);
int main (void)
{
double x,y;
printf("enter two number\n");
scanf("%lf %lf",&x,&y);
larger_of(&x,&y);
printf("the big numberis %.1f %.1f",x,y);
return 0;
}
void larger_of (double * x,double * y)
{
double temp;
temp = (*x >*y)? *x:*y;
*x = temp;
*y = temp;
}
9.6
#include <stdio.h>
void larger_of (double * x, double * y,double *z);
int main (void)
{
double x,y,z;
printf("enter three number\n");
scanf("%lf %lf %lf",&x,&y,&z);
printf("befor: x : %.1f y: %.1f z : %.1f\n",x,y,z);
larger_of(&x,&y,&z);
printf("after: x : %.1f y: %.1f z : %.1f",x,y,z);
return 0;
}
void larger_of (double * x,double * y,double *z)
{
double temp_max,temp_min,temp_mid;
if (*x > *y)
{
if (*z > *x)
{
temp_max = *z;
temp_min = *y;
temp_mid = *x;
}
else
{ temp_max = *x;
temp_min = (*y > *z)? *z:*y;
temp_mid = (*y > *z)? *y:*z;
}
}
else
{
if (*z > *y)
{
temp_max = *z;
temp_min = *x;
temp_mid = *y;
}
else
{ temp_max = *y;
temp_min = (*x > *z)? *z:*x;
temp_mid = (*x > *z)? *x:*z;
}
}
*x = temp_min;
*y = temp_mid;
*z = temp_max;
}
9.9
#include <stdio.h>
double power(double n, int p);
int main(void)
{
double x, xpow;
int exp;
printf("Enter a number and the positive integer power");
printf(" to which\nthe number will be raised. Enter q");
printf(" to quit.\n");
while (scanf("%lf%d", &x, &exp) == 2)
{
xpow = power(x,exp);
printf("%.3g to the power %d is %.5g\n", x, exp, xpow);
printf("Enter next pair of numbers or q to quit.\n");
}
printf("Hope you enjoyed this power trip -- bye!\n");
return 0;
}
double power(double n, int p)
{
double pow = 1;
int i;
if (p == 0 )
{
if (n ==0)
{
printf("the 0^0 is not define and as the value is 1\n");
pow = 1;
}
else
pow = 1;
}
else
{
if (p == 1)
pow = n;
else
{
pow = power(n,p-1)*n;
}
}
return pow;
}
个人作业 C primer plus 第4章 -第九章 9.9 答案
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转载自blog.csdn.net/qq_36324796/article/details/78993656
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