if statments

This is a discussion on if statments within the C++ Programming forums, part of the General Programming Boards category; ok... im making a one player RPG game in my programming class and i cant seem to find anywhere in ...

  1. #1
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    Question if statments

    ok... im making a one player RPG game in my programming class and i cant seem to find anywhere in the deitel and deitel book that it will tell you how to make a piece of code that will repond IF someone types a WORD not a LETTER. i can get the letters to work find with the SWITCH command. only thing is, i cant get default to work on switch. so if anyone can help me please reply:

    QUESTIONS:
    -If statments using a WORD not a LETTER.
    -Defaults in the switch commands.

    JPed

  2. #2
    Confused Magos's Avatar
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    Re: if statments

    -If statments using a WORD not a LETTER.

    I assume you mean string? You cannot compare strings with the = operator ( if(String1 = String2) ), so you have to use strcmp(String1, String2) which returns 0 if the strings are equal.

    -Defaults in the switch commands.
    Code:
    switch(MyVar)
    {
       case 0:
          ...
       break;
       case 1:
       case 2:
       case 3:
          ...
       break;
       default:
          ...
       break;
    }
    Which part don't you understand? You can't compare strings with switch statements either, if that's what you're asking...
    MagosX.com

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    Teach a man to fish and you feed him for a lifetime.

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    ok... the strcmp im assuming is just the same as the IF. and ive got it working for now. but now i need to make it if they equal it in lowercase or capital case, then it will do the same either way... is there anyway to make the string always equal lower or capital case?

    JPed

    oh yea... borland 5 also
    Last edited by JPed2003; 05-10-2002 at 01:40 PM.

  4. #4
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    oh yea... and the default isnt working... its repeating the default no matter what letter they enter.. its working... except for that... like this.......

    computer: Enter a command:
    user: n(stands for north)
    computer: (1,0)... thats the users position
    computer: Enter a command: Invalid command!(then from here it lets you enter another command but it does the invalid command everytime)

    my code:
    while ( ( command = cin.get() ) != 'x' ){//X is for exit
    switch (command){
    case 1:
    ...
    break;

    default:
    cout << "Invalid command!" << endl;
    break;
    }
    }

    sorry if thats ugly.. .but i think its right... but if not it is on mine everything except for the default...

    JPed

  5. #5
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    first, isn't is cin.get(command)? I don't know, you might be right on that one. But what your problem is is that you are comparing the ASCII value (char casted to an int by switch) of command to an integer, 1. A user is not likely to enter the ASCII character corresponding to 1. If you want to get a numeric value, and trust the user to enter a number, then you can use atoi() on the command.

  6. #6
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    Your can map a word to an int, then switch is in the way.

    Code:
    #include <iostream>
    #include <string>
    #include <cctype>
    
    using namespace std;
    
    void main()
    {
        // build command map
        string commands[] = {
             "east", "north", "south", "west" // ... all the command word with lower case
        };
        const int nCount = sizeof(commands)/sizeof(string);
    
        // receive command from console and convert to lowercase
        string strCmd;
        cin >> strCmd;
        for(int i=0; i<strCmd.size(); i++)
            strCmd[i] = _tolower(strCmd[i]);
    
        // map command to int
        for(i=0; i<nCount; i++)
        {
            if(strCmd == commands[i])
                break;
        }
    
        // execute command
        switch(i)
        {
        case 0:
            //do_command_east();
            break;
        case 1:
            //do_command_north();
            break;
    
        // ...
    
        default:
            cout << "Unknow command." << endl;
        }
    }
    Hello, everyone.

  7. #7
    Confused Magos's Avatar
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    Originally posted by JPed2003
    while ( ( command = cin.get() ) != 'x' ){//X is for exit
    switch (command){
    case 1:
    ...
    break;

    default:
    cout << "Invalid command!" << endl;
    break;
    }
    }
    Is this for the user to press button '1'?
    Then you should have case '1': instead. Command is prolly a char, so you must compare it with '1' (the character 1), not 1 (the number 1).
    MagosX.com

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    Teach a man to fish and you feed him for a lifetime.

  8. #8
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    ok... case 1 isnt actually the number one... im just using it as it being the first case... the real one is actually case 'n':.... i know what im doing alittle bit

    JPED

  9. #9
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    and hotman_x is my hero

    jped

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