tasksssss

#include<stdio.h>

 #define size 5

int main()

{   int sum1=0,sum2=0,sum3=0,sum4=0,sum5=0,sum6=0,sum7=0,sum8=0,i;

    int math[size]={91,67,88,78,81};

    int physics[size]={87,79,81,86,87};

    int programming[size]={86,81,85,92,87};

    for(i=1;i<=4;i++)

    { sum1+=physics[i];

    sum2+=math[i];

        sum3+=programming[i];}

    sum4=math[0]+physics[0]+programming[0];

    sum5=math[1]+physics[1]+programming[1];

     sum6=math[2]+physics[2]+programming[2];

    sum7=math[3]+physics[3]+programming[3];

    sum8=math[4]+physics[4]+programming[4];

    printf("%d %d %d %d %d %d %d %d",sum1,sum2,sum3,sum4,sum5,sum6,sum7,sum8);

}

 

 

求字符串长度

#include<stdio.h>

char s[]="you are pizza of shit";

int main()

{

    

int length;

    length=Strlen();

    printf("you are pizza of shit\n");

    printf("the length of s is %d",length);

    

}

int Strlen()

{   int i=0,j=0;

    while(s[i]!='\0')

       j++,i++;

        return (j);

}

 

 

interchange function:

#include <stdio.h>

int *swap(int *px, int *py)

{int temp;

    temp = *px;

    *px = *py;

    *py = temp;

    return px;

}

int main(void)

{

 

int i = 10, j = 20;

int *p = swap(&i, &j);

printf("now i=%d j=%d *p=%d\n", i, j, *p);

return 0;

 }