C Primer Plus after-school programming exercises

Chapter two

1.

//打印姓名
#include<stdio.h>
int main()
{
    printf("Gustav Mahler\n");
    printf("Gustav\n");
    printf("Mahler\n");
    printf("Gustav Mahler\n");
    return 0;
}

2.

// print the name and address 
#include <stdio.h> int main () 
{ 
    the printf ( " Jack Ma \ n- " ); 
    the printf ( " CHINA \ n- " );
     return 0 ; 
}
 

3.

//输入年龄返回天数
#include<stdio.h>
int main()
{
    int i_age,i_days;
    printf("please type you age：\n");
    scanf("%d",&i_age);
    i_days = 365 * i_age;
    printf("convert to days is：%d",i_days);
    return 0;
}

4.

//调用函数进行打印
#include<stdio.h>

void jolly()
{   int i;
    for(i=0;i<3;i++)
        printf("For he is a jolly good fellow!\n");
}

void deny()
{
    printf("Which nobody can deny!");
}

int main()
{
    jolly();
    deny();
}

5. ( contents of two sub-functions are not displayed, Resolved ) [call functions malformed, do not need to add in front of void]

#include<stdio.h>

void br()
{
    printf("Brazil,Russia\n");
}

void ic()
{
    printf("India,China\n");
}

int main()
{
    printf("Brazil,Russia,India,China");
    void br();
    void ic();
}

6 ( to be investigation using pow (toes, 2) calculating the square 10, the output is 99; if the direct pow (10,2) normal, direct toes * toes are normal )

#include<stdio.h>
#include<math.h>

int main()
{
    int toes = 10;
    int i_twice,i_square;
    i_twice = toes * 2;
    i_square = pow(toes,2);
    printf("The twice of toes is:%d\n",i_twice);
    printf("The square of toes is:%d\n",i_square);
    return 0;
}

7.

#include<stdio.h>

void joker()
{
    printf("Smile!");
}

//换行
void nn()
{
    printf("\n");
}

int main()
{
    joker();joker();joker();nn();
    joker();joker();nn();
    joker();nn();
}

8.

#include<stdio.h>

void one_three()
{
    printf("one\n");
    two();
    printf("three");

}

void two()
{
    printf("two\n");
}

int main()
{
    printf("starting now:\n");
    one_three();
    return 0;

}

third chapter

1.