用 switch case 修改 7：如图

//用 switch case 修改 7：基本工资 10.00 美元/小时 加班（超过40小时）1.5倍时间 税率 前300美元为%15 下一个150美元为%20 余下的为%25 不关心是否符合税法#include "stdafx.h"#include "stdlib.h"#define LTR 0.15#define STR 0.2#define OTR 0.25int main()  {  int time,a,b,i,sum=0,r;double x=0.0,y=0,z=0,BS;double ave=0;printf("\aEnter the numbercorresponding to the desired pay rate or action:\n");for(i=0;i<=63;i++)printf("*");printf("\n");printf("1)$8.75/hr\t\t\t\t\t2)$9.33/hr\n3)$10.00/hr\t\t\t\t\t4)11.20/hr\n5)quit\n");for(i=0;i<=63;i++)printf("*");printf("\n");scanf("%d",&r);switch(r){case 1:BS=8.75;break;case 2:BS=9.33;break;case 3:BS=10.00;break;case 4:BS=11.20;break;case 5:goto A; }printf("\aPlease input the times:_____\b\b\b\b\b");scanf("%d",&time);if(time>40){time*=BS;sum+=(BS*1.5)*time;}elsesum=time*=BS;printf("\aThe wage is %d\n",sum);a=sum-300;b=a-150;x=b*OTR;y=(sum-a)*LTR;z=(sum-b)*STR;if(sum>300)printf("Tax is %0.2f\n",x+y+z);elseprintf("Need not pay tax\n");printf("Net salary is %0.2f\n",sum-(x+y+z));system("pause");    return 0;A:printf("NULL\n");system("pause");}