print chars as keys are hit

Hello everyone.

I found this method

Code:

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TCHAR win_getch()

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(below) on a website which is used for printing the characters as the keys on keyboard are hit i-e without hitting the ENTER key. This method is used in a while loop like this

Code:

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while ((c = win_getch()) != 13)
{}

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I wanted to know why is the character compared to

Code:

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13

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i-e

Code:

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if((c = win_getch()) != 13) then do something

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Code:

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/**
 * This function will simulate the getch() function from conio.h.
 * Note that this does not work for special keys like F1-F12, arrow keys,
 * even the ESC key does not seem to work with this function.
 * @return TCHAR read from input buffer.
 */
TCHAR win_getch() {
        DWORD mode;
        TCHAR theChar = 0;
        DWORD count;
        //get a handle to stdin
        HANDLE hStdIn = GetStdHandle(STD_INPUT_HANDLE);
        //save the current input mode...
        GetConsoleMode(hStdIn,&mode);
        // Clear the mode, turn off ENABLE_ECHO_INPUT and ENABLE_LINE_INPUT
        // so that the output will not be echoed and will not pause until the end of
        // a line for input.
        SetConsoleMode(hStdIn,0);       
        // Read in 1 char from the input buffer.
        ReadConsole(hStdIn,&theChar,sizeof(TCHAR),&count,NULL);
        //restore the current input mode.
        SetConsoleMode(hStdIn, mode);               
        return theChar;
}

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Quote:

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Originally Posted by gulHK

I wanted to know why is the character compared to

Code:

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13

---

i-e

Code:

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if((c = win_getch()) != 13) then do something

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http://en.wikipedia.org/wiki/Carriage_return

Thanks