为什么我的代码运行后显示空白？ [复制]

Question

我是 C 的初学者并开始自学。 我这里的代码基本上是试图计算一个工人的每周工资 我必须输入否。每周来自用户的小时数。 这是我正在解决的问题

在这个挑战中，你将创建一个 C 程序来计算你 周薪。

程序应要求用户结束在 一周通过键盘

程序应在输出中显示总工资、税金和 净工资。

应做出以下假设：

• 基本工资率 = 12.00 美元/小时
• 加班（超过 40 小时）= 时间半

• 税率：

  • 前 300 美元的 15%
  • 接下来 150 美元的 20%
  • 其余的 25%

当我运行代码时，它要求我输入否。进入后只显示空白的小时数 我知道它很长很简单，但我仍然面临问题

帮助非常感谢

#include <stdio.h>

int main(void)
{
    float hrs=0;
    float grossPay,taxes,netPay;
    float bpr=12.00;
    printf("The number of hours worked in a week: ");
    scanf("%f\n",&hrs);
    if (hrs<=40)
        grossPay=(hrs*bpr);
        printf("Gross Pay:%f\n",grossPay);
        if (grossPay<=300)
            taxes=0.15*grossPay;
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);
        if (grossPay>300 && grossPay<=450)
            taxes=0.15*300+0.20*(grossPay-300);
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);
        if (grossPay>450)
            taxes=0.15*300+0.20*150+0.25*(grossPay-450);
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);
    if (hrs>40)
        grossPay=40*bpr+18.00*(hrs-40);
        printf("Gross Pay:%f\n",grossPay);
        if (grossPay<=300)
            taxes=0.15*grossPay;
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);
        if (grossPay>300 && grossPay<=450)
            taxes=0.15*300+0.20*(grossPay-300);
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);
        if (grossPay>450)
            taxes=0.15*300+0.20*150+0.25*(grossPay-450);
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);


   return 0;
}

我为相同的代码做了一个替代代码。哪个更有效？：

#include <stdio.h>

#define PAYRATE 12.00
#define TAXRATE_300 .15
#define TAXRATE_150 .20
#define TAXRATE_REST .25
#define OVERTIME 40

int main()
{

   int hrs = 0;
   double grossPay = 0.0;
   double taxes = 0.0;
   double netPay = 0.0;

   printf("The number of hrs worked this week: ");

   scanf("%d", &hrs);


   if (hrs <= 40)
       grossPay = hrs * PAYRATE;
   else
   {
     grossPay = 40 * PAYRATE;
     double overTimePay = (hrs - 40) * (PAYRATE * 1.5);
     grossPay += overTimePay;
   }


   if (grossPay <= 300)
   {
       taxes = grossPay * TAXRATE_300;
   }
   else if(grossPay > 300 && grossPay <= 450)
   {
       taxes = 300 * TAXRATE_300;
       taxes += (grossPay - 300) * TAXRATE_150;
   }
   else if (grossPay > 450)
   {
       taxes = 300 * TAXRATE_300;
       taxes += 150 * TAXRATE_150;
       taxes += (grossPay - 450) * TAXRATE_REST;
   }


   netPay = grossPay - taxes;


   printf("Your gross pay this week is: %.2f\n", grossPay);
   printf("Your taxes this week is: %.2f\n", taxes);
   printf("Your net pay this week is: %.2f\n", netPay);

   return 0;
}

Answer 1

这是因为您在对scanf 的调用结束时有\n——这要求它读取空格，直到空白块结束（即非空白字符）。只需删除\n。

另外请注意，您的 if 语句代码周围缺少大括号（{、}）。

Answer 2

问题出在这一行：

scanf("%f\n",&hrs);

相反，它应该是：

scanf("%f",&hrs);

修复了代码，还添加了缺少的花括号：

#include <stdio.h>

int main(void)
{
    float hrs=0;
    float grossPay,taxes,netPay;
    float bpr=12.00;
    printf("The number of hours worked in a week: ");
    scanf("%f",&hrs);
    if (hrs<=40) {
        grossPay=(hrs*bpr);
        printf("Gross Pay:%f\n",grossPay);
        if (grossPay<=300) {
            taxes=0.15*grossPay;
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);
        }
        if (grossPay>300 && grossPay<=450) {
            taxes=0.15*300+0.20*(grossPay-300);
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);
        }
        if (grossPay>450) {
            taxes=0.15*300+0.20*150+0.25*(grossPay-450);
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);
        }
    }
    if (hrs>40) {
        grossPay=40*bpr+18.00*(hrs-40);
        printf("Gross Pay:%f\n",grossPay);
        if (grossPay<=300) {
            taxes=0.15*grossPay;
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);
        }
        if (grossPay>300 && grossPay<=450) {
            taxes=0.15*300+0.20*(grossPay-300);
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);
        }
        if (grossPay>450) {
            taxes=0.15*300+0.20*150+0.25*(grossPay-450);
            netPay=grossPay-taxes;
            printf("Total taxes:%f\n",taxes);
            printf("Net Pay:%f\n",netPay);
        }
   }

   return 0;
}