编写求两个数的和,差及平均值的3个函数,在主函数中调用它们并输出结果

#include <stdio.h>
int main(void)
{
int a,b,x,y,z;
int sum(int a,int b);
int avg(int a,int b);
int different(int a,int b);
scanf("%d%d",&a,&b);
x=sum(a,b);
y=avg(a,b);
z=different(a,b);
printf("sum=%d avg=%d different=%d\n",x,y,z);
return 0;
}
int sum(int a,int b)
{
return a+b;
}
int avg(int a,int b)
{
return (a+b)/2;
}
int different(int a,int b)
{
return a-b;
}

运行结果
输入8 4
sum=12 avg=6 different=4