记录——《C Primer Plus （第五版）》第七章编程练习第八题

来源：互联网发布：淘宝助手怎么上架宝贝编辑：程序博客网时间：2024/05/01 19:27

 修改练习7中的假设a，使程序提供一个选择工资等级的菜单。用switch选择工资等级。程序运行的开头应该像这样： ***************************************************************** Enter the number corresponding to the desired pay rate or acion: 1）$8.75/hr          2) $9.33/hr             3) $10.00/hr         4) $11.20/hr   5) quit    *****************************************************************     如果选择1到4，那么程序应该请求输入工作小时数。程序应该一直循环运行，直到输入5.如果输入1到5以外的选项，那么程序应该提醒用户合适的选项是哪些，然后再循环。用#define为各种工资等级和税率定义常量。

# include <stdio.h># define GRADE1 8.75   //  工资# define GRADE2 9.33# define GRADE3 10.00# define GRADE4 11.20# define RATE1 0.15    //  税率# define RATE2 0.20# define RATE3 0.25void wagefn(double, int); // 计算工资和税金的函数int main(void){    int grade;    double hour;    printf("****************************************************************\n");    printf("Enter the number corresponding to the desired pay rate or acion:\n");    printf("1')' $8.75'/'hr                2')' $9.33'/'hr\n");    printf("1')' $10.00'/'hr                2')' $11.20'/'hr\n");    printf("5')' quit\n");    printf("****************************************************************\n");    while(1)    {          printf("请输入工资等级：\n");        scanf("%d", &grade);   //输入工资等级        if(grade <= 0 || grade>5)        {            printf("请输入1到5以内的数!\n");        }        switch(grade)          //  不同等级分开计算        {        case 1 : printf("请输入工作小时数：\n");            scanf("%lf", &hour);            wagefn(hour,grade);            break;        case 2 : printf("请输入工作小时数：\n");            scanf("%lf", &hour);            wagefn(hour,grade);            break;        case 3 : printf("请输入工作小时数：\n");            scanf("%lf", &hour);            wagefn(hour,grade);            break;        case 4 : printf("请输入工作小时数：\n");            scanf("%lf", &hour);            wagefn(hour,grade);        }        if(5 == grade)            break;    }    return 0;}void wagefn(double hour, int grade){    double wage, tax;    switch(grade)    {    case 1: wage = GRADE1;        break;    case 2: wage = GRADE2;        break;    case 3: wage = GRADE3;        break;    case 4: wage = GRADE4;    }    if(hour < 0)        return ;    if(hour <= 40)    {        wage = wage * hour;        if(wage > 450)            tax = 70 + (wage - 450) * RATE3;        else if(wage > 300)            tax = 45 + (wage - 300) * RATE2;        else if(wage >= 0)            tax = wage * RATE1;    }    else if(hour > 40)    {        wage = wage * (40 + (hour-40) * 1.5);        if(wage > 450)            tax = 70 + (wage - 450) * RATE3;        else if(wage > 300)            tax = 45 + (wage - 300) * RATE2;        else if(wage >= 0)            tax = wage * RATE1;    }    printf("工资总额：%.3lf 税金：%.3lf 净工资：%.3lf\n", wage, tax, wage-tax);}

0 0