请编写函数，其功能是对传送过来的两个浮点数求出和值与差值，并通过形参传送回调用函数。谢谢！

乱写的

   看似很简单啊，你看一下我自己写的，看错在哪儿
    #include <stdio.h>
    double he(double *,double *);
    double cha(double *,double *);
    main()
   {  double a ,b,H,C;
     printf("Input two number:\n");
     scanf("%f%f",&a,&b);
     H=he(&a,&b);
     C=cha(&a,&b);
    }
    double he(double*x,double*y)
      { double HE;
        HE=*x+*y;
        return HE;
       }
     double cha(double*x,double*y)
         {double CHA;
           CHA=*x-*y;
           return CHA;
          }

#include <stdio.h>

void get_sum_dec(float a, float b, float *sum, float *dec)
{
    *sum = a + b;
    *dec = a - b;
}
int main(void)
{
    float a, b, sum, dec;
    scanf("%f%f", &a, &b);
    get_sum_dec(a,b,&sum,&dec);

    printf("sum = %f, dec = %f\n", sum, dec);
}

#include <stdio.h>
    double he(double *,double *);
    double cha(double *,double *);
    main()
   {  double a ,b,H,C;
     printf("Input two number:\n");
     scanf("%lf%lf",&a,&b);
     H=he(&a,&b);
     C=cha(&a,&b);
    printf("H = %lf C = %lf\n", H, C);
    }
    double he(double*x,double*y)
      { double HE;
        HE=*x+*y;
        return HE;
       }
     double cha(double*x,double*y)
         {double CHA;
           CHA=*x-*y;
           return CHA;
          }

呵呵，又是你，刚才那题也是你解答，你知道吗，这两题困扰了我很久了，看了你的精彩解答让我从心底里敬佩你，谢谢啦！交个朋友如何QQ985018936