计算三个数的平均值

/*平均值计算*/
#include<stdio.h>
#include<stdlib.h>

int main(void)
{
double n1,n2,n3,average; /*3个输入数、平均值变量*/

printf("\n Welcome.\nCalculate the average.\n"
"give three numbers.\n"); /*打印程序标题*/

printf("Input three numbers(eg.1.2,2.3,3.4):");
scanf("%lf,%lf,%lf",&n1,&n2,&n3); /*输入三个数据*/

average=(n1+n2+n3)/3.0; /*计算平均值*/

printf("average=%.2f\n",average); /*输出平均值*/

system("PAUSE");
return 0;
} /*end main*/