#include<stdio.h>

main()
{
    float average=0;
    int mile;
    float gallon;
    float shishu;
    int i=0;
    float zongshishu ;
    while(i<3)
    {
        printf("enter driven mile\n");
        scanf("%d\n",&mile);
        printf("enter use gallon\n");
        scanf("%f\n",&gallon);
        shishu=mile/gallon;
        zshishu+=shishu;
        printf("%f",shishu);
        i++;
    }

    average=zshishu/3;
    printf("%f\n",average);
}


题目是：在车行驶是读入总公里数和每次加油的燃料数，计算并显示每加仑平均行驶的里程数，然后是显示每加仑平均行驶的里程数

ps:编译通过了，打算出来的结果不对，望高人指教。。。谢谢

#include<stdio.h>

main()//这个修改为int main（void)比较标准
{
    float average=0;
    int mile;
    float gallon;
    float shishu;
    int i=0;
    float zongshishu;
    while(i<3)
    {
        printf("enter driven mile\n");
        scanf("%d\n",&mile);//改为scanf（"%d",&mile);
        printf("enter use gallon\n");
        scanf("%f\n",&gallon);//改为scanf("%d",&gallon);
        shishu=mile/gallon;
        zshishu+=shishu;
        printf("%f",shishu);
        i++;
    }

    average=zshishu/3;
    printf("%f\n",average);
//加返回值return（0）；
}
还有zongshishuo和zshishuo这个应该也会报错吧！




#include<stdio.h>

int main(void)
{
    float average=0;
    int mile;
    float gallon;
    float shishu;
    int i=0;
    float zshishu ;
    while(i<3)
    {
        printf("enter driven mile\n");
        scanf("%d",&mile);
        printf("enter use gallon\n");
        scanf("%f",&gallon);
        shishu=mile/gallon;
        zshishu+=shishu;
        printf("%f",shishu);
        i++;
    }

    average=zshishu/3;
    printf("%f\n",average);
    return(0);
}
这是在我这VC6.0上可以运行的，希望对你有帮助.

zshishu没有付初值

我也菜鸟。  是不是那个zshishu没有初始化啊？
float zshishu = 0；试试看？

#include<stdio.h>
 
void main()
 {
     float average=0;
     int mile;
     float gallon;
     float shishu;
     int i=0;
     float zongshishu ;
     while(i<3)
     {
         printf("enter driven mile\n");
         scanf("%d",&mile);  //去掉\n
         printf("enter use gallon\n");
         scanf("%f",&gallon);  //去掉\n
         shishu=mile/gallon;
         zongshishu+=shishu;
         printf("%f\n",shishu);  //加上\n
         i++;
     }
 
     average=zongshishu/3;
     printf("%f\n",average);
 }
zongshishu不要写成zshishu了

小问题，仔细点。

scanf函数尽量不要加那些杂七杂八的东西..加了后你自己烦恼去吧
scanf("%d\n",&mile);
很容易出错的

新人同求学习！

scanf（）注意点，自己百度下，里面不能乱加东东啊，你把他里面的\n去掉应该就ok了，在看看printf和scanf这两个的函数吧，

学习C要记得自己慢慢分析，一处处查找，很多问题都是自己不小心造成的！！！
#include<stdio.h>
 
int main()
 {
     float average=0;
     int mile;
     float gallon;
     float shishu;
     int i=0;
     float zongshishu ;
     while(i<3)
     {
         printf("enter driven mile\n");
         scanf("%d",&mile);
         printf("enter use gallon\n");
         scanf("%f",&gallon);
         shishu=mile/gallon;
         zongshishu+=shishu;
         printf("%f\n",shishu);
         i++;
     }
 
    average=zongshishu/3;
     printf("%f\n",average);
    return 0;
 }