int getfirst(void)
{int choice=-1;choice=getchar();skip_word();return choice;
}   //读取第一个字符

/*根据工作时间，计算工资*/
#include<stdio.h>
//基本工资等级
#define BASEPAY1 8.75
#define BASEPAY2 9.33
#define BASEPAY3 10.00
#define BASEPAY4 11.20
//税率
#define TAX_RATE1 0.15
#define TAX_RATE2 0.20
#define TAX_RATE3 0.25int worktime_test(double worktime);   //测试工作时间数据是否大于零的函数原型
int hourly_wage_test(double hourly_wage);   //测试时薪是否正常
double custom(void);
void skip_word(void);       //跳过多余的输入
int getfirst(void); //读取第一个输入
int main()
{int choice=0; //选择变量double wages=0.0,workhour=0.0,taxes=0.0;//工资总额、工作时间、税金int i;//打印程序的选项界面for(i=0;i<=64;i++)printf("*");printf("nEnter the number corresponding to the desired pay rate or action:n"   //显示菜单，提示用户输入"请选择类型n""1) $8.75/hrtttt2) $9.33/hrn""3) $10.00/hrtttt4) $11.20/hrn""5) 自定义工资（时薪）ttt6)quitn");for(i=0;i<=64;i++)printf("*");printf("n");while((choice=getfirst())!=EOF){switch(choice){case '1':do{printf("请输入工作时长（小时）:n");scanf("%lf",&workhour);if(worktime_test(workhour))continue;//工资总额if(workhour<=40) //非加班工资wages=BASEPAY1*workhour;else{workhour=(workhour-40)*1.5;   //去掉不算在加班内的时间wages=BASEPAY1*workhour;wages += 40*BASEPAY1;}//税金计算if(wages<=300)taxes=wages*TAX_RATE1;else if(wages<=450){taxes=(wages-300)*TAX_RATE2;taxes+=45;}else{taxes=(wages-450)*TAX_RATE3;taxes+=75;}break;}while(1);break;case '2':do{printf("请输入工作时长（小时）:n");scanf("%lf",&workhour);if(worktime_test(workhour))continue;if(workhour<=40)wages=BASEPAY2*workhour;else{workhour=(workhour-40)*1.5;wages=BASEPAY2*workhour;wages+=40*BASEPAY2;}//税金计算if(wages<=300)taxes=wages*TAX_RATE1;else if(wages<=450){taxes=(wages-300)*TAX_RATE2;taxes+=45;}else{taxes=(wages-450)*TAX_RATE3;taxes+=75;}break;}while(1);break;case '3':do{printf("请输入工作时长（小时）:n");scanf("%lf",&workhour);if(worktime_test(workhour))    //判断用户输入的时间是否为正确数据continue;if(workhour<=40)wages=BASEPAY3*workhour;else{workhour=(workhour-40)*1.5;wages=BASEPAY3*workhour;wages+=40*BASEPAY3;}//税金计算if(wages<=300)taxes=wages*TAX_RATE1;else if(wages<=450){taxes=(wages-300)*TAX_RATE2;taxes+=45;}else{taxes=(wages-450)*TAX_RATE3;taxes+=75;}break;}while(1);break;case '4':do{                                        //do while如果用户输入错误的值，可以再次输入printf("请输入工作时长（小时）:n");scanf("%lf",&workhour);if(worktime_test(workhour))continue;if(workhour<=40)wages=BASEPAY4*workhour;else{workhour=(workhour-40)*1.5;wages=BASEPAY4*workhour;wages+=40*BASEPAY4;}//税金计算if(wages<=300)taxes=wages*TAX_RATE1;else if(wages<=450){taxes=(wages-300)*TAX_RATE2;taxes+=45;}else{taxes=(wages-450)*TAX_RATE3;taxes+=75;}break;}while(1);break;case '5':           //自定义工资区域wages=custom();   //自定义工资计算总工资的函数if(wages<=300)taxes=wages*TAX_RATE1;else if(wages<=450){taxes=(wages-300)*TAX_RATE2;taxes+=45;}else{taxes=(wages-450)*TAX_RATE3;taxes+=75;}break;case '6':goto out;default:printf("请输入正确的选项：n");continue;}printf("您的工资总额为:t%.3lf dollarn税金为:tt%.3lf dollarn净收入为:t%.3lf dollarn",wages,taxes,wages-taxes);skip_word();}
out:printf("再见n");return 0;
}//测试用户输入工作时长是否大于零的函数
int worktime_test(double worktime)
{if (worktime<0){    printf("你还让老板给你打工了？n");return 1;}if (worktime==0){printf("不工作哪来的工资？n");return 1;}return 0;
}
int hourly_wage_test(double hourly_wage)
{if (hourly_wage<0){ printf("这怎么涅，还倒搭钱？n");return 1;}if (hourly_wage==0){printf("意思白干呗？n");return 1;}return 0;
}
//自定义工资 计算工资总额
double custom(void)
{double hourly_wage=0.0,worktime=0.0,wages=0.0;do{printf("请输入您的时薪：n");if(!(scanf("%lf",&hourly_wage)==1)){  skip_word();continue;}if(hourly_wage_test(hourly_wage))continue;do{printf("请输入您工作的时间：n");scanf("%lf",&worktime);//if(worktime_test(worktime))//  continue;}while(worktime_test(worktime));   //while循环测试工作时间是否小于零wages=hourly_wage*worktime;break;}while(1);return wages;
}
void skip_word(void)
{while(getchar()!='n')continue;
}   //跳过错误的输入字
int getfirst(void)
{int choice=-1;choice=getchar();skip_word();return choice;
}   //读取第一个字符