7.12.8

Posted 2021-10-25 eisnull

#  7.12.8
#include <stdio.h>
#define over_time  1.5 * 10
#define three_hundred_rate  0.15
#define one_hundred_half_rate  0.2
#define more_then_four_hun_half_rate  0.25
#define three_hundred  45
#define four_hundred_half  75
float rate(float n);
int main(void)
{
    float hours;
    float wage;
    float basic_wage = 0;
    int grade;

   while (1)
    {
    printf("*****************************************************************\\n");
    printf("Enter the number corresponding to the desired pay rate or action:\\n");
    printf("1) $8.75/hr                     2) $9.33/hr\\n");
    printf("3) $10.00/hr                    4) $11.20/hr\\n");
    printf("5) quit                                     \\n");
    printf("*****************************************************************\\n");

        if (scanf("%d", &grade) == 1)
        {
            switch (grade)
            {
                case 1:
                          basic_wage = 8.75;
                          break;
                case 2:
                          basic_wage = 9.33;
                          break;
                case 3:
                          basic_wage = 10.00;
                          break;
                case 4:
                          basic_wage = 11.20;
                          break;
                case 5:
                          goto quit;
            }
            
            printf("basic_wage is %f\\n", basic_wage);
            printf("请输入工作时长：");
            scanf("%f", &hours);
            if (( hours <= (float)40) && (hours >= 0))
                wage = basic_wage * hours;
            else 
                wage = basic_wage * 40 + (hours - (float)40) * over_time;
            printf("工资总额:%.2f，税金：%.2f，净收入：%.2f\\n",
                    wage, rate(wage), wage - rate(wage));
        }
        else
             printf("请输入正确选项！\\n");
    }
    quit: printf("再见！\\n");
    return 0;
}

float rate(float n)    // 函数定义
{
    float tax;
    if (n <= 300)
        tax = three_hundred_rate * n;
    else if (n <= 450)
        tax = three_hundred + (n - (float)300) * one_hundred_half_rate;
    else 
        tax = four_hundred_half + (n - (float)450) * more_then_four_hun_half_rate; 

    return tax;    // 返回tax的值
}

在其中使用了goto语句，如果不使用goto语句怎么写？