如何读取实数输入并使用它们

Question

你好，我在编码方面经验很少，但我在学校解决的问题要求我有一个输入，例如“ 12.5 ”，并处理该输入以给我一定的输出。

我正在尝试修改这段代码来做到这一点，但没有成功

代码在C

例如，“rate”类似于“12.5”，但它只读取“” 12" 然后它继续计算 12，并忽略 .5

我需要它来阅读全文12.5

感谢您提供的任何帮助。

#include <stdio.h>

int main ()
{
    int hours_2weeks;
    int rate;
    int Gross_Pay;
    int Social_security_tax;
    int Federal_tax;
    int State_tax;
    int Medical_dental;
    int Net_Pay;
    printf("\nPayroll Program for X Y Z Corp.\n");
    {
    printf("Enter hours worked: ");
    scanf("%d", &hours_2weeks);

    printf("Enter hourly rate: ");
    scanf("%d", &rate);
    }
    printf("This employee worked %d hours with a salary of $%d per hour. Here is the salary statement for this employee:\n",hours_2weeks,rate);

    Gross_Pay=hours_2weeks*rate;
    printf("Gross Pay: %d\n", Gross_Pay);
    Social_security_tax=hours_2weeks*rate*.06;
    printf("Social security tax: -%d\n", Social_security_tax);
    Federal_tax=hours_2weeks*rate*.1;
    printf("Federal tax: -%d\n", Federal_tax);
    State_tax=hours_2weeks*rate*.05;
    printf("State tax: -%d\n", State_tax);
    Medical_dental=hours_2weeks*rate*.05;
    printf("Medical/dental: -%d\n", Medical_dental);
    Net_Pay=hours_2weeks*rate-(hours_2weeks*rate*.06)-(hours_2weeks*rate*.1)-(hours_2weeks*rate*.05)-(hours_2weeks*rate*.05);
    printf("Net Pay: %d\n", Net_Pay);
}

Answer 1

rate 是整型变量。将其更改为 float，并将 scanf 调用更改为

scanf("%f", &rate);

Answer 2

当您需要小数点时，您必须将数据类型更改为 float 或 double，当您这样做时，您必须将格式说明符更改为 %f float 和 %lf 用于 double。

Answer 3

您将所有输入变量定义为整数。即使您键入双精度值，系统也会 covert/cast 将这些值转换为整数...

您正在这样做：

 int hours_2weeks;
 printf("Enter hours worked: ");
 scanf("%d", &hours_2weeks);

改为：

double hours_2weeks;
printf("Enter hours worked: ");
scanf("%lf", &hours_2weeks);

Answer 4

您已将速率声明为：int rate;，它的作用是，速率变量现在只能存储整数值（如 1,4,66,3333，尽管它有上限）而不是浮点数（如 3.55、4.2112、34.533，带小数的数字）。

为了能够存储浮点值（带小数点的数字），您需要将速率延迟为：float rate;。此外，为了能够将浮点值打印到控制台输出，您需要将 printf 和 scanf 的格式说明符从 %d

替换为 %f

Answer 5

谢谢，现在它完成了我需要它做的事情。

#include <stdio.h>
int main()

{

float hours_2weeks;
float rate;
float Gross_Pay;
float Social_security_tax;
float Federal_tax;
float State_tax;
float Medical_dental;
float Net_Pay;
//printf("\nPayroll Program for X Y Z Corp.\n");
{
printf("Enter hours worked: ");
scanf("%f", &hours_2weeks);

printf("Enter hourly rate: ");
scanf("%f", &rate);
}
printf("This employee worked %d hours with a salary of $%d per hour. Here is the salary statement for this employee:\n",hours_2weeks,rate);

Gross_Pay=hours_2weeks*rate;
printf("Gross Pay: %.2f\n", Gross_Pay);
Social_security_tax=hours_2weeks*rate*.06;
printf("Social security tax: -%.2f\n", Social_security_tax);
Federal_tax=hours_2weeks*rate*.1;
printf("Federal tax: -%.2f\n", Federal_tax);
State_tax=hours_2weeks*rate*.05;
printf("State tax: -%.2f\n", State_tax);
Medical_dental=hours_2weeks*rate*.05;
printf("Medical/dental: -%.2f\n", Medical_dental);
Net_Pay=hours_2weeks*rate-(hours_2weeks*rate*.06)-(hours_2weeks*rate*.1)-(hours_2weeks*rate*.05)-(hours_2weeks*rate*.05);
printf("Net Pay: %.2f\n", Net_Pay);
}

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