题目

1.证明P++等价于（p）++还是等价于*（p++）？

#include <stdio.h>
int main()
{
    int a=5;
    int *p=&a;
    printf("p=%d\n",p);              //p=6487620
    printf("p++=%d\n",p++);          //p++=6487620
    p=&a;
    printf("(p)++=%d\n",(p)++);      //(p)++=6487620
    printf("*(p++)=%d\n",*(p++));    //*(p++)=6487628
 }

2 题目6-1 计算两数的和与差

(1) 实验代码

#include<stdio.h>
void sum_diff( float op1, float op2, float *psum, float *pdiff );

int main()
{
    float a, b, sum, diff;

    scanf("%f %f", &a, &b);
    sum_diff(a, b, &sum, &diff);
    printf("The sum is %.2f\nThe diff is %.2f\n", sum, diff);
    
    return 0; 
}

void sum_diff( float op1, float op2, float *psum, float *pdiff )
{
  *psum=op1+op2;
  *pdiff=op1-op2;
}

(2) 设计思路