c/c++语言开发共享切换案例菜单

我正在尝试制作一个程序，提示用户提供这样的选项菜单

***************************************************************** Enter the number corresponding to the desired pay rate or action: 1) $8.75/hr 2) $9.33/hr 3) $10.00/hr 4) $11.20/hr 5) quit ***************************************************************** 

然后根据工资率计算净工资，工资总额和税金。 我已经完成了所有的工资率，但是实际的费率菜单给了我一些问题。如果用户输入5，它应该退出，如果输入任何其他的1到5然后再循环并再次询问正确的选择。 如果输入不是1到5，我有问题回收。

 #include "stdafx.h" #include "stdio.h" #include "stdlib.h" #include "ctype.h" #define HOURLY0 8.75 #define HOURLY1 9.33 #define HOURLY2 10 #define HOURLY3 11.20 #define TAXRATE .15 #define TAXRATE2 .20 #define TAXRATE3 .25 #define OVERTIME 15 int _tmain(int argc, _TCHAR* argv[]) { float hours, grossPay = 0, netPay, tax = 0, tax3 = 0,hourly; int menu = 0,wrong =1; char quit; printf("Enter the number corresponding to the desired pay rate or action : nn1) $8.75/hr 2) $9.33/hr n3) $10.00/hr 4) $11.20/hr n5) quitnn"); scanf_s("%d", &menu); while (menu != 5 ) { do { switch (menu) { case 1: hourly = HOURLY0; break; case 2: hourly = HOURLY1; break; case 3: hourly = HOURLY2; break; case 4: hourly = HOURLY3; break; default: printf("Enter right choice from 1 to 5 onlyn"); printf("Enter the number corresponding to the desired pay rate or action : nn1) $8.75/hr 2) $9.33/hr n3) $10.00/hr 4) $11.20/hr n5) quitnn"); scanf_s("%d", &menu); wrong; break; } } while (!wrong);/* HOW CAN I MAKE IT TO RECYCLE IF INPUT IS OTHER THAN 1-5*/ printf("nEnter hours worked in the week: "); scanf_s("%f", &hours); if (hours > 40) { grossPay = (40 * hourly) + ((hours - 40) * OVERTIME); if (grossPay  300 && grossPay  450) { tax3 = grossPay - 450; tax = (300 * TAXRATE) + ((grossPay - 300 - tax3)*TAXRATE2) + ((grossPay - 300 - 150)*TAXRATE3); } } else if (hours < 40) { grossPay = (hours * hourly); if (grossPay  300 && grossPay  450) { tax3 = grossPay - 450; tax = (300 * TAXRATE) + ((grossPay - 300 - tax3)*TAXRATE2) + ((grossPay - 300 - 150)*TAXRATE3); } } netPay = grossPay - tax; printf("nGross Pay : %2.3fnTax: %13.3fnNet Pay: %10.3fnn", grossPay, tax, netPay); system("cls"); printf("Enter the number corresponding to the desired pay rate or action : nn1) $8.75/hr 2) $9.33/hr n3) $10.00/hr 4) $11.20/hr n5) quitnn"); scanf_s("%d", &menu); } system("pause"); return 0; } 

 int GetUserInput( void ) { int menu; for (;;) { menu = 0; printf("Enter the number corresponding to the desired pay rate or action : nn1) $8.75/hr 2) $9.33/hr n3) $10.00/hr 4) $11.20/hr n5) quitnn"); if ( scanf( "%d", &menu ) != 1 ) exit( 1 ); if ( menu >= 1 && menu <= 5 ) return menu; printf( "Enter right choice from 1 to 5 onlyn" ); } } int main( void ) { int menu = 0; while ( menu != 5 ) { menu = GetUserInput(); switch ( menu ) { case 1: printf( "n*** You selected 1 ***nn" ); break; case 2: printf( "n*** You selected 2 ***nn" ); break; case 3: printf( "n*** You selected 3 ***nn" ); break; case 4: printf( "n*** You selected 4 ***nn" ); break; case 5: printf( "Byen" ); break; } } } 

 char buffer[256]; while (fgets(buffer,sizeof(buffer),stdin)!=NULL) { if (sscanf(buffer, "%d", &n) == 1) { switch(n) {...} } else { ... some error output ... } } 

 if(wrong) continue; //restart from the outer-while 

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