Returning to main menu

This is a discussion on Returning to main menu within the C++ Programming forums, part of the General Programming Boards category; On my calculator, it asks the user what they want to do.(switch/case functions) After the person adds, subtracts, multiplys or ...

  1. #1
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    Returning to main menu

    On my calculator, it asks the user what they want to do.(switch/case functions)
    After the person adds, subtracts, multiplys or divides the 2 numbers, the calculator exits. Instead of using return 0 and having it exit, how can I have it return to the main menu?

  2. #2
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    You can use a while loop, and then the last menu item can be something like "Exit". If the person types in the menu number corresponding to exit, then make the while loop terminate.

  3. #3
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    Thank you. I will see what I can do.

  4. #4
    Registered User subdene's Avatar
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    Jan 2002
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    359
    I did something very similar a very long time ago..... (hence not using the standard and all that stuff) help this helps a bit. You may need to add an extra case statement for an exit option or something.

    Code:
    #include <iostream.h>
    #include <conio.h>
    
    void MenuHeader(char Buffer[],int BufferLength);
    
    int main()
    {
      const int MAX_BUFFER=512;
    
      char Buffer[MAX_BUFFER];
      short Answer,Num1,Num2,Quotient,Remainder;
      int MenuNum;
    
      do
      {
        MenuHeader(Buffer,MAX_BUFFER);
        MenuNum = atoi(Buffer);
    
        switch(MenuNum)
        {
          case 1: GetNumbers(Num1,Num2,MenuNum);
                  Addition(Num1,Num2,Answer);
                  DisplayResults(Num1,Num2,Answer,0,0);
                  break;
          case 2: GetNumbers(Num1,Num2,MenuNum);
                  Subtraction(Num1,Num2,Answer);
                  DisplayResults(Num1,Num2,Answer,0,0);
                  break;
          case 3: GetNumbers(Num1,Num2,MenuNum);
                  Multiply(Num1,Num2,Answer);
                  DisplayResults(Num1,Num2,Answer,0,0);
                  break;
          case 4: GetNumbers(Num1,Num2,MenuNum);
                  Division(Num1,Num2,Quotient,Remainder);
                  DisplayResults(Num1,Num2,Quotient,Remainder,MenuNum);
                  break;
          case 5: GetNumbers(Num1,Num2,MenuNum);
                  Powers(Num1,Num2);
                  break;
          case 6: GetNumbers(Num1,Num2,MenuNum);
                  EvenNumbers(Num1);
                  break;
          case 7: GetNumbers(Num1,Num2,MenuNum);
                  ShiftLeft(Num1,Answer);
                  DisplayResults(Num1,Num2,Answer,0,0);
                  break;
          case 8: GetNumbers(Num1,Num2,MenuNum);
                  DecBinary(Num1);
                  break;
          case 9: GetNumbers(Num1,Num2,MenuNum);
                  Cubes(Num1);
        }
      }while(MenuNum != 10);
    
      return 0;
    }
    
    void MenuHeader(char Buffer[],int BufferLength)
    {
      clrscr();
      cout << "******************************Assembler Calculator******************"
           <<"************\n1. Addition\n2. Subtraction\n3. Multiply\n4. Divide\n"
           << "5. Powers\n6. Even Numbers\n7. Shift Left\n8. Decimal to Binary\n"
           << "9. Cubes\n10. Quit\n\nWhere do you want to go today? ";
      cin.clear();
      cin.get(Buffer,BufferLength,'\n');
      cin.ignore();
    }
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