程序代码：

#include <stdio.h>
int main()
{
    float op1,op2,*psum,*pdiff;
    void sum_diff(float op1,float op2,float *psum,float *pdiff);
    printf("输入两个数：");
    scanf("%d%d",&op1,&op2);
    sum_diff(op1,op2,*psum,*pdiff);       // cannot convert parameter 3 from 'float' to 'float *'

    printf("%f+%f=%f",op1,op2,*psum);
    printf("%f-%f=%f",op1,op2,*pdiff);
    return 0;
}
void sum_diff(float op1,float op2,float *psum,float *pdiff)
{
    *psum=op1+op2;
    *pdiff=op1-op2;
}