C 我的代码继续打印出零，我不知道为什么

有人看到我似乎错过的错误吗？它只是继续打印0.00而不停止，不知道它为什么这样做。它很早就开始工作了，我没有做任何会影响它的改变，所以我真的很困惑

 int main (int argc, const char * argv[])
   {
int i, j, numStudents;
double total, average, difference, lessThan, greater, exchange;

 total = 0;

while (scanf("%1d", &numStudents) != EOF)
{
    /* Ends program at zero */
    if (!numStudents)
    {
        return 0;
    }

    double amountSpent[numStudents];

    total = 0;
    greater = 0;
    lessThan = 0;

        for(i = 0; i < numStudents; i++)
        {
           scanf("%1lf\n", &amountSpent[i]);
            total += amountSpent[i];

        }


        /* cleans total, than calculates */

        average = total/numStudents;



    exchange = 0;

        for(i = 0; i < numStudents; i++)
        {
            difference = amountSpent[i] - average;

            if (difference < 0)
            {
                lessThan += difference;
            }
            else
            {
                greater += difference;
            }

        }

 /*   if (-lessThan > greater)
    {
            exchange = -lessThan;
    }

    else
    {
        exchange = greater;
    }
   */

    exchange = (-lessThan > greater)? -lessThan : greater;
    printf("$%.2f\n", exchange);

}
return 0;
}

`

 int main (int argc, const char * argv[])
   {
int i, j, numStudents;
double total, average, difference, lessThan, greater, exchange;

 total = 0;

while (scanf("%1d", &numStudents) != EOF)
{
    /* Ends program at zero */
    if (!numStudents)
    {
        return 0;
    }

    double amountSpent[numStudents];

    total = 0;
    greater = 0;
    lessThan = 0;

        for(i = 0; i < numStudents; i++)
        {
           scanf("%1lf\n", &amountSpent[i]);
            total += amountSpent[i];

        }


        /* cleans total, than calculates */

        average = total/numStudents;



    exchange = 0;

        for(i = 0; i < numStudents; i++)
        {
            difference = amountSpent[i] - average;

            if (difference < 0)
            {
                lessThan += difference;
            }
            else
            {
                greater += difference;
            }

        }

 /*   if (-lessThan > greater)
    {
            exchange = -lessThan;
    }

    else
    {
        exchange = greater;
    }
   */

    exchange = (-lessThan > greater)? -lessThan : greater;
    printf("$%.2f\n", exchange);

}
return 0;
}

int main（int argc，const char*argv[]
{
int i、j、NUM学生；
双倍合计、平均值、差额、小于、大于、交换；
总数=0；
while（scanf（“%1d”，&numStudents）！=EOF）
{
/*程序在零结束*/
如果（！numStudents）
{
返回0；
}
双倍金额[学生]；
总数=0；
大于等于0；
lessThan=0；
对于（i=0；i更大）
{
交换=-小于等于1；
}
其他的
{
交换=更大；
}
*/
交换=（-lessThan>更大）？-lessThan：更大；
printf（“$%.2f\n”，交换）；
}
返回0；
}

---

`

如果没有提示和使用

scanf（）

尾部的

'\n'

，用户输入会被混淆。尽管有些想法可能会有所帮助，但Else代码确实有效

 int main (int argc, const char * argv[])
   {
int i, j, numStudents;
double total, average, difference, lessThan, greater, exchange;

 total = 0;

while (scanf("%1d", &numStudents) != EOF)
{
    /* Ends program at zero */
    if (!numStudents)
    {
        return 0;
    }

    double amountSpent[numStudents];

    total = 0;
    greater = 0;
    lessThan = 0;

        for(i = 0; i < numStudents; i++)
        {
           scanf("%1lf\n", &amountSpent[i]);
            total += amountSpent[i];

        }


        /* cleans total, than calculates */

        average = total/numStudents;



    exchange = 0;

        for(i = 0; i < numStudents; i++)
        {
            difference = amountSpent[i] - average;

            if (difference < 0)
            {
                lessThan += difference;
            }
            else
            {
                greater += difference;
            }

        }

 /*   if (-lessThan > greater)
    {
            exchange = -lessThan;
    }

    else
    {
        exchange = greater;
    }
   */

    exchange = (-lessThan > greater)? -lessThan : greater;
    printf("$%.2f\n", exchange);

}
return 0;
}

奇怪的是，将输入数字限制为1个字符，-建议将

1

放在说明符之前

 int main (int argc, const char * argv[])
   {
int i, j, numStudents;
double total, average, difference, lessThan, greater, exchange;

 total = 0;

while (scanf("%1d", &numStudents) != EOF)
{
    /* Ends program at zero */
    if (!numStudents)
    {
        return 0;
    }

    double amountSpent[numStudents];

    total = 0;
    greater = 0;
    lessThan = 0;

        for(i = 0; i < numStudents; i++)
        {
           scanf("%1lf\n", &amountSpent[i]);
            total += amountSpent[i];

        }


        /* cleans total, than calculates */

        average = total/numStudents;



    exchange = 0;

        for(i = 0; i < numStudents; i++)
        {
            difference = amountSpent[i] - average;

            if (difference < 0)
            {
                lessThan += difference;
            }
            else
            {
                greater += difference;
            }

        }

 /*   if (-lessThan > greater)
    {
            exchange = -lessThan;
    }

    else
    {
        exchange = greater;
    }
   */

    exchange = (-lessThan > greater)? -lessThan : greater;
    printf("$%.2f\n", exchange);

}
return 0;
}

也要针对

==1

而不是

进行测试EOF

用于处理非数字输入

 int main (int argc, const char * argv[])
   {
int i, j, numStudents;
double total, average, difference, lessThan, greater, exchange;

 total = 0;

while (scanf("%1d", &numStudents) != EOF)
{
    /* Ends program at zero */
    if (!numStudents)
    {
        return 0;
    }

    double amountSpent[numStudents];

    total = 0;
    greater = 0;
    lessThan = 0;

        for(i = 0; i < numStudents; i++)
        {
           scanf("%1lf\n", &amountSpent[i]);
            total += amountSpent[i];

        }


        /* cleans total, than calculates */

        average = total/numStudents;



    exchange = 0;

        for(i = 0; i < numStudents; i++)
        {
            difference = amountSpent[i] - average;

            if (difference < 0)
            {
                lessThan += difference;
            }
            else
            {
                greater += difference;
            }

        }

 /*   if (-lessThan > greater)
    {
            exchange = -lessThan;
    }

    else
    {
        exchange = greater;
    }
   */

    exchange = (-lessThan > greater)? -lessThan : greater;
    printf("$%.2f\n", exchange);

}
return 0;
}

// while (scanf("%1d", &numStudents) != EOF)
while (puts("Enter students (0 to quit)", scanf("%d", &numStudents) == 1)

检查用户输入的结果是个好主意。放下

scanf（）

尾部的

'\n'

 int main (int argc, const char * argv[])
   {
int i, j, numStudents;
double total, average, difference, lessThan, greater, exchange;

 total = 0;

while (scanf("%1d", &numStudents) != EOF)
{
    /* Ends program at zero */
    if (!numStudents)
    {
        return 0;
    }

    double amountSpent[numStudents];

    total = 0;
    greater = 0;
    lessThan = 0;

        for(i = 0; i < numStudents; i++)
        {
           scanf("%1lf\n", &amountSpent[i]);
            total += amountSpent[i];

        }


        /* cleans total, than calculates */

        average = total/numStudents;



    exchange = 0;

        for(i = 0; i < numStudents; i++)
        {
            difference = amountSpent[i] - average;

            if (difference < 0)
            {
                lessThan += difference;
            }
            else
            {
                greater += difference;
            }

        }

 /*   if (-lessThan > greater)
    {
            exchange = -lessThan;
    }

    else
    {
        exchange = greater;
    }
   */

    exchange = (-lessThan > greater)? -lessThan : greater;
    printf("$%.2f\n", exchange);

}
return 0;
}

// scanf("%1lf\n", &amountSpent[i]);
puts("Enter amount spent");
if (1 != scanf("%lf", &amountSpent[i])) {
  return 1;
}