scan codes and getch

This is a discussion on scan codes and getch within the C++ Programming forums, part of the General Programming Boards category; it always displays going up no matter what key is pressed can anyone tell me why? edit: the keys i ...

  1. #1
    Registered User
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    Sep 2002
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    scan codes and getch

    it always displays going up no matter what key is pressed can anyone tell me why?

    edit: the keys i want to be used are w a s d
    Code:
    #include <iostream>
    #include <conio.h>
    using namespace std;
    
    int main ()
    {
    /* variables */
    int key;
    
    /* variables end */
    
    top:
    
    if (kbhit())
    {
        key = _getch(); 
    	
    	if (key = 119)
    	{
    		cout<<"Going Up \n";
    	}
    
    	else if (key = 115)
    	{
    		cout<<"Going down \n";
    	}
    	else if (key = 97)
    	{
    		cout<<"Going left \n";
    	}
    	else if (key = 100)
    	{
    		cout<<"Going right \n";
    	}
    }
    goto top;
    
    return 0;
    }
    Compiler: MSVC++ 6.0

  2. #2
    I lurk
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    Code:
    if (kbhit())
    {
        key = _getch(); 
    	
    	if (key = 119)
    	{
    		cout<<"Going Up \n";
    	}
    
    	else if (key = 115)
    	{
    		cout<<"Going down \n";
    	}
    	else if (key = 97)
    	{
    		cout<<"Going left \n";
    	}
    	else if (key = 100)
    	{
    		cout<<"Going right \n";
    	}
    }
    Use == for comparison. You're assigning 119 to key every time.

  3. #3
    Registered User Aran's Avatar
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    and, on a lighter note, comments like "/*start variables */" are relatively worthless, because they add nothing to the users comprehension to the code. Comments should supplement the code.

    and also, who else has noticed the rash of problems EXACTLY like this one?

  4. #4
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  5. #5
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    i just keep /* start variables */ for my use no one is learning anything from my code
    Compiler: MSVC++ 6.0

  6. #6
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    > no one is learning anything from my code
    You never know.

    If your scanning for input, then looping each time, you could try a switch/case statement.
    However, it's off the top of my head and I don't know how well it will work.

    As far as checking for scan codes, I've found this chart to be decent.
    Last edited by Shadow; 09-13-2002 at 10:41 PM.
    The world is waiting. I must leave you now.

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