c - 简单的无限 while 循环-- c

Question

我知道我应该自己调试它...但请相信我，我已经尝试过了，但我感到非常尴尬。我不明白为什么我的 while 循环会无限循环。谁能帮忙？

#include <stdio.h>

int main ( void )
{
    double milesDriven;
    double gallonsUsed;
    double totalMilesDriven;
    double totalGallonsUsed;
    float milesPerGallon;
    float totalMpG;

printf( "%s", " Enter the gallons used (-1 to end): " );
scanf( "%i", &gallonsUsed);

printf( " Enter the miles driven: " );
scanf( "%i", &milesDriven);


while ( gallonsUsed != -1 || milesDriven != -1)
{
     totalGallonsUsed += gallonsUsed;
     totalMilesDriven += milesDriven;

     milesPerGallon = ( milesDriven / gallonsUsed );
     printf( " The miles/gallon for this tank was %f\n", milesPerGallon );

     printf( "%s", " Enter the gallons used (-1 to end): " );
     scanf( "%i", &gallonsUsed);

     printf( " Enter the miles driven: " );
     scanf( "%i", &milesDriven);

}


totalMpG = ( totalMilesDriven / totalGallonsUsed );
printf( " The overall average miles/gallon was %.6f\n ", totalMpG); 
return 0;    
}

Answer 1

乍一看，您似乎在使用 float 据类型，而您应该使用整数。

"%i" // expects an integer

尝试使用 int 数据类型，或将格式更改为 "%lf"