C Primer Plus第六版第七章第八题

#include<stdio.h> #define H_WAGE1 8.75 #define H_WAGE2 9.33 #define H_WAGE3 10.00 #define H_WAGE4 11.20 #define TIME1 30 #define TIME2 40 #define RATE_T 1.5 #define RATE1 0.15 #define RATE2 0.2 #define RATE3 0.25 #define BREAK1 300 #define BREAK2 450 int main(void) { float time,total,tax,net,H_WAGE; int choice; 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"); printf("Enter the choice:\n"); scanf("%d",&choice); if(choice==1||choice==2||choice==3||choice==4||choice==5) { switch(choice) { case 1: H_WAGE=H_WAGE1; printf("Your choice is 1,$8.75/hr.\n"); break; case 2: H_WAGE=H_WAGE2; printf("Your choice is 2,$9.33/hr.\n"); break; case 3: H_WAGE=H_WAGE3; printf("Your choice is 3,$10.00/hr.\n"); break; case 4: printf("Your choice is 4,$11.20/hr.\n"); H_WAGE=H_WAGE4; break; case 5: printf("Your choice is 5,to quit.\n"); H_WAGE=0; break; default: printf("Enter the right number.\n"); break; } } else printf("Enter the right number.\n"); while(H_WAGE!=0) { printf("Please enter the working time per week:\n"); while(scanf("%f",&time)==1) { if(time>=0) { if(time<=TIME1) { total=time*H_WAGE; tax=total*RATE1; } else if(time<TIME2) { total=time*H_WAGE; tax=TIME1*H_WAGE*RATE1+(time-TIME1)*H_WAGE*RATE2; } else { time=TIME2+(time-TIME2)*RATE_T; total=time*H_WAGE; if(total<BREAK2) tax=TIME1*H_WAGE*RATE1+(time-TIME1)*H_WAGE*RATE2; else tax=TIME1*H_WAGE*RATE1+(BREAK2-BREAK1)*RATE2+(total-BREAK2)*RATE3; } net=total-tax; printf("Time is %.2f hours,total income is %.2f,tax is %.2f,net income is %.2f\n" ,time,total,tax,net); } else printf("Time cannot be negtive.\n") ; printf("Enter time again or q to quit.\n"); H_WAGE=0; } } printf("Done!\n"); return 0; }