#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/************************************/
/* practice 1 第七章作业 */
/***********************************/
void p7_1(void)
{
char ch;
int n_space = 0;
int n_break = 0;
int n_number = 0;
printf("输入一段字符串：");
while((ch=getchar()) != '#')
{
if(ch == '\n')
{
n_break++;
}
else if(ch == ' ')
{
n_space++;
}
else
{
n_number++;
}
}
printf("一共有空格：%d个\n一共有换行符：%d个\n共有字符：%d个",n_space,n_break,n_number);
}
/************************************/
/* practice 2 第七章作业 */
/***********************************/
void p7_2(void)
{
char ch;
printf("输入一段字符串：");
int count=0;
while((ch=getchar()) != '#')
{
count++;
printf("%c:%d\t",ch,ch);
if(count%8==0)
{
putchar('\n'); //printf("\n")相同
}
}
}
/************************************/
/* practice 3 第七章作业 */
/***********************************/
void p7_3(void)
{
int input;
int even=0;
double sum_even=0;
int odd=0;
double sum_odd=0;
printf("请输入整数：");
while(scanf("%d",&input)==1 && input !=0)
{
if(input %2 ==0)
{
even++;
sum_even += input;
}
else
{
odd++;
sum_odd += input;
}
printf("请输入整数：");
}
printf("输入偶数的个数是：%d,平均值是:%.2lf \n输入奇数的个数是：%d,平均值是:%.2lf",even,sum_even/even,odd,sum_odd/odd);
}
/************************************/
/* practice 4 第七章作业 */
/***********************************/
void p7_4(void)
{
char ch;
int count1=0,count2=0;
while((ch=getchar()) != '#')
{
if(ch=='.')
{
count1++;
putchar('!');
}
else if(ch == '!')
{
count2++;
putchar('!');
putchar('!');
}
else
{
putchar(ch);
}
}
printf("用感叹号替换句号替换了%d次\n",count1);
printf("用两个感叹号替换原来感叹号替换了%d次",count2);
}
/************************************/
/* practice 5 第七章作业 */
/***********************************/
void p7_5(void)
{
char ch;
int count1=0,count2=0;
while((ch=getchar()) != '#')
{
switch(ch)
{
case '.':
putchar('!');
count1++;
break;
case '!':
putchar('!');
putchar('!');
count2++;
break;
default:
putchar(ch);
}
}
printf("用感叹号替换句号替换了%d次\n",count1);
printf("用两个感叹号替换原来感叹号替换了%d次",count2);
}
/************************************/
/* practice 6 第七章作业 */
/***********************************/
void p7_6(void)
{
char ch,ch_pre;
int count=0;
while((ch=getchar())!='#')
{
if(ch == 'i') //新的一轮输入字符，若ch=='i'
{
if(ch_pre == 'e') //而且上一轮输入ch_pre=='e'的话
{
count++; //计数+1
}
}
ch_pre =ch; //把当前输入字符作为上一次输入字符
}
printf("ei出现的次数是%d次",count);
}
/************************************/
/* practice 7 第七章作业 */
/***********************************/
#define SALARY1 10.0
#define RATE1 0.15
#define RATE2 0.2
#define RATE3 0.25
void p7_7(void)
{
int hour;
double total; //工资总额
double tax; //税金
double salary; //净收入
printf("a.基本工作 = 10.00美元/小时\n");
printf("b.加班（超过40小时） = 1.5倍时间\n");
printf("c.税率:\t前300美元为15%%\n\t续150美元为20%%\n\t余下的为25%%\n");
printf("请输入你一周工作的小时数：");
scanf("%d",&hour);
if(hour>40)
{
total = (hour*1.5) * SALARY1;
}
else
{
total = hour * SALARY1;
}
if(total<300)
{
tax = total * RATE1;
}
else if(total>300 && total<=450)
{
tax = 300*RATE1 + (total-300)*RATE2;
}
else
{
tax = 300*RATE1 + 150*RATE2 + (total - 450)*RATE3;
}
salary = total - tax;
printf("你这周的的工资总额：%.2lf,税金：%.2lf,净收入：%.2lf",total,tax,salary);
}
/************************************/
/* practice 8 第七章作业 */
/***********************************/
void p7_8(void)
{
int hour;
double total; //工资总额
double tax; //税金
double income; //净收入
int choice; //输入选择项
double salary;
printf("*****************************************************************\n");
printf("Enter the number corresponding to the desired pay rate or action:\n");
printf("1)%-10s\t2)%-10s\n3)%-10s\t4)%-10s\n5)%-10s\n","$8.75/hr","$9.33/hr","$10.00/hr","$11.20/hr","quit");
printf("*****************************************************************\n");
printf("Enter the number corresponding to the desired pay rate or action:\n");
while((scanf("%d",&choice)==1) &&choice !=5)
{
switch(choice)
{
case 1:
salary = 8.75;
break;
case 2:
salary = 9.33;
break;
case 3:
salary = 10.00;
break;
case 4:
salary = 11.20;
break;
default:
printf("请输入1~5以内的数字！\n");
break;
}
printf("请输入你一周工作的小时数：");
scanf("%d",&hour);
if(hour>40)
{
total = (hour*1.5) * salary;
}
else
{
total = hour * salary;
}
if(total<300)
{
tax = total * RATE1;
}
else if(total>300 && total<=450)
{
tax = 300*RATE1 + (total-300)*RATE2;
}
else
{
tax = 300*RATE1 + 150*RATE2 + (total - 450)*RATE3;
}
income = total - tax;
printf("你这周的的工资总额：%.2lf,税金：%.2lf,净收入：%.2lf\n",total,tax,income);
printf("Enter the number corresponding to the desired pay rate or action:\n");
}
printf("Done");
}
/************************************/
/* practice 10 第七章作业 */
/***********************************/
void p7_10(void)
{
int choice = 0;
double income = 0;
double threshold = 0;
double tax = 0;
while (1)
{
printf("请选择你的类型:\n");
printf("1) 单身\n2) 户主\n3) 已婚，共有\n4) 已婚，离异\n请输入你的选择:");
scanf("%d", &choice);
switch (choice)
{
case 1:
threshold = 17850.0;
break;
case 2:
threshold = 23900.0;
break;
case 3:
threshold = 29750.0;
break;
case 4:
threshold = 14875.0;
break;
default:
printf("输入有误，请输入1-4的数字!");
continue;
}
printf("请输入你的工资:");
scanf("%lf", &income);
if (income < threshold)
{
tax = income * 0.15;
}
else
{
tax = threshold * 0.15 + (income - threshold) * 0.28;
}
printf("类别:%d, 净收入:%.2lf, 税金:%.2lf\n", choice, income, tax);
}
}
/************************************/
/* practice 11 第七章作业 */
/***********************************/
#define PRICE1 2.05 //洋蓟的价钱
#define PRICE2 1.15 //甜菜的价钱
#define PRICE3 1.09 //胡萝卜的价钱
void p7_11(void)
{
double p_artichoke=0; //洋蓟的磅数
double p_beet=0; //甜菜的磅数
double p_carrot=0; //胡萝卜的磅数
double sum_artichoke=0; //洋蓟的总数
double sum_beet=0; //甜菜的总数
double sum_carrot=0; //胡萝卜的总数
char choice=0;
double p_total=0; //订购的重量（单位磅）
double totalCost=0; //总费用
double discount=1; //折扣价
double packingCost=0; //运费及包装费
double cost=0;
printf("《订货商店》-共有以下三种食材:\n");
printf("a)%-6sb)%-6sc)%-6s\n","洋蓟","甜菜","胡萝卜");
while(choice!='q')
{
printf("请输入你要订购的的食材(按q退出)：");
fflush(stdin);
choice=getchar();
fflush(stdin);
switch(choice)
{
case 'a':
printf("请输入洋蓟的磅数：");
scanf("%lf",&p_artichoke);
sum_artichoke += p_artichoke;
break;
case 'b':
printf("请输入甜菜的磅数：");
scanf("%lf",&p_beet);
sum_beet += p_beet;
break;
case 'c':
printf("请输入胡萝卜的磅数：");
scanf("%lf",&p_carrot);
sum_carrot += p_carrot;
break;
case 'q':
continue;
default:
printf("输入有误，请重新输入!\n");
break;
}
}
p_total = p_artichoke + p_beet + p_carrot; //订购的重量（单位磅）
if(p_total<5)
{
packingCost = 6.5;
}
else if(p_total>5 && p_total<=20)
{
packingCost = 14;
}
else
{
packingCost = 14+(p_total-20)*0.5;
}
totalCost = sum_artichoke*PRICE1 + sum_beet*PRICE2 + sum_carrot*PRICE3;
if(totalCost>100)
{
discount = 0.95; //在添加运费之前100美元订单有5%的打折优惠
}
if(totalCost==0)
{
cost=0;
packingCost=0;
discount=0;
}
else
{
cost = totalCost*discount+packingCost;
}
printf("%-10s%-10s%-24s%-12s\n","商品名称","物品售价","订购的重量（单位：磅）","订购蔬菜费用");
printf("%-10s$%-10.2lf%-24.2lf$%-12.2lf\n","洋蓟",PRICE1,p_artichoke,p_artichoke*PRICE1);
printf("%-10s$%-10.2lf%-24.2lf$%-12.2lf\n","甜菜",PRICE2,p_beet,p_beet*PRICE2);
printf("%-10s$%-10.2lf%-24.2lf$%-12.2lf\n","胡萝卜",PRICE3,p_carrot,p_carrot*PRICE3);
printf("%-12s%-6s%-14s%-12s\n","订单总费用","折扣","运费和包装费","费用总额");
printf("$%-12.2lf%-6.2lf$%-14.2lf$%-12lf",totalCost,discount,packingCost,cost);
}
int main()
{
p7_11();
return 0;
}