C语言从键盘输入3个数，求平均值并输出（求平均值写成自定义函数）

Answer 1

#include <stdio.h>

void Avg(int a,int b,int c)
{
printf("%.3f\n",(float)((a+b+c)/3.0));
}

void main()
{
int a,b,c;
printf("Please input 3 number:\n");
printf("First one:\n");
scanf("%d",&a);
printf("Second one:\n");
scanf("%d",&b);
printf("Third one:\n");
scanf("%d",&c);
Avg(a,b,c);
}

Answer 2

程序在VC++上通过调试了的

#include<stdio.h>

float avevalue(float a,float b,float c)
{
return (a+b+c)/3;
}
void main()
{
float a,b,c,aver;
scanf("%f %f %f",&a,&b,&c);
aver = avevalue(a,b,c);
printf("\n%f\n",aver);
}

Answer 3

float avevalue(float f1,float f2,float f3)
{
return (f1+f2+f3)/3;
}
void main()
{
float f1,f2,f3,f;
scanf("%f,%f,%f",&f1,&f2,&f3);
f = avevalue(f1,f2,f3);
printf("\n%f",f);
}