[問題] 印不出所要的結果
程式碼如下
#include<stdio.h>
int main(void)
{
int counter;
float total1;
float total2;
float num1;
float num2;
float num3;
float average;
total1=0;
total2=0;
counter=0;
printf("Enter the gallons used (-1 to end):\n");
scanf("%f",&num1);
while (num1!=-1)
{
total1 = total1+num1;
counter = counter+1;
printf("Enter the miles driven:\n");
scanf("%f",&num2);
num3=(float)num2/(float)num1;
printf("The miles / gallon for this tank was %.6f\n",num3);
printf("Enter the gallons used (-1 to end):\n");
scanf("%f",&num1);
}
total2 = total2+num2;
if (counter!=0)
{
average=(float)total2/(float)total1;
printf("The overall average miles/gallon was %.6f\n",average);
}
return 0;
}
程式跑到最後，也就是if的那部分，跑不出小弟所要的結果，
例如我先輸入12.8，再輸入287，得出來應該是22.421875，之後小弟輸入-1，
來跳出while迴圈，但最後那一行應該要顯示
The overall average miles/gallon was 22.421875
但卻顯示其他數字，請問小弟哪裡有寫錯嗎?
這問題想了好久都想不出來，煩請高手指點一下!!
感謝您!!
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剛小弟試著把total2 = total2+num2; 放到while迴圈外
跑出來小弟所需要的了，但是如果輸入多組數字，又會出現不是小弟所需要的結果。
在請教一下各位高手，如果是多組的話，要怎麼跑出正確的結果呢?
※ 編輯: ggyy940 來自: 210.64.151.204 (03/20 20:40)
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