程序代码：

#include <stdio.h>     //运行出来是随机数，谁能告诉我这是为什么？
int main()
{
    float op1,op2,sum,diff;
    void sum_diff(float op1,float op2,float*psum,float*pdiff);
    printf("input 2 figures:");
    scanf("%d%d",&op1,&op2);
    sum_diff(op1,op2,&sum,&diff);
    printf("sum=%d\ndiff=%d\n",sum,diff);
    return 0;
}
void sum_diff(float op1,float op2,float*psum,float*pdiff)
{
    *psum=op1+op2;
    *pdiff=op1-op2;
}