#include<stdio.h>
void main()
{int num1,num2,num3;
float average;
printf("Please input three numbers:");
scanf("%d,%d,%d",&num1,&num2,&num3);
average=(num1+num2+num3)/3.0;
printf("average=%7.2\n",average);
}


输出的是“average=”   ，具体等于多少就不知道了，为什么呢？

你没有发现你少了%f吗？

#include<stdio.h>
 void main()
 {int num1,num2,num3;
 float average;
 printf("Please input three numbers:");
 scanf("%d,%d,%d",&num1,&num2,&num3);
 average=(num1+num2+num3)/3.0;
 printf("average=%7.2f\n",average);//这里少了一个f
 }
 

#include<stdio.h>

int main(void)
{
    int num1,num2,num3;
    float average;

    printf("Please input three numbers:\n");

   
    scanf("%d %d %d", &num1, &num2, &num3);

    average = (num1+num2+num3) / 3.0;

    printf("average = %f\n", average);

    return 0;
}

#include<stdio.h>
 void main()
 {int num1,num2,num3;
 float average;
 printf("Please input three numbers:");
 scanf("%d,%d,%d",&num1,&num2,&num3)//这里如果在%d之间有逗号，输入那三个数时就需要在每两个数之间加一个逗号，否则就把%d之间的逗号去掉吧，
 average=(num1+num2+num3)/3.0;
 printf("average=%7.2\n",average);//这里在2后面加上f，
 }
 

谢谢各位了