codeblocks compilation error, C Tutorial

This is a discussion on codeblocks compilation error, C Tutorial within the C Programming forums, part of the General Programming Boards category; In Windows I'm getting a compilation error in code blocks when doing the c tutorial. Wondering if someone may know ...

  1. #1
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    Question codeblocks compilation error, C Tutorial

    In Windows I'm getting a compilation error in code blocks when doing the c tutorial. Wondering if someone may know why? I've even copy and pasted the code from the tutorial with the same return. However the program runs fine when compiled and run in the terminal in Linux.
    Code:
    #include <stdio.h>
    
    int main()
    {
     int this_is_a_number
    
     printf(  "Please enter a number: ");
     scanf( "%d", &this_is_a_number );
     printf( "You entered %d", this_is_a_number );
    getchar ();
    return 0;
    }
    Compile errors:
    ||=== Variable1, Debug ===|
    C:\Users\Corey\Documents\CProjects\Variable1\Varia ble1\main.c|7|error: expected '=', ',', ';', 'asm' or '__attribute__' before 'printf'|
    C:\Users\Corey\Documents\CProjects\Variable1\Varia ble1\main.c|8|error: 'this_is_a_number' undeclared (first use in this function)|
    C:\Users\Corey\Documents\CProjects\Variable1\Varia ble1\main.c|8|error: (Each undeclared identifier is reported only once|
    C:\Users\Corey\Documents\CProjects\Variable1\Varia ble1\main.c|8|error: for each function it appears in.)|
    ||=== Build finished: 4 errors, 0 warnings ===|

  2. #2
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    Check your line endings.

  3. #3
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    Code:
    int this_is_a_number;You forget ";" here

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    thanks guy's, can't beleive I did'nt see that. Must of had tunnel vision.

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    Can you omit getchar () from the program? It doesn't seem to affect the program. If someone else could weigh in that would be great.

  6. #6
    a guy with long hair Xupicor's Avatar
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    You could have read what the compiler said about it, it was quite clear.

    @lvl99, it's probably there to keep the terminal window open, to see the program results. I agree it is not needed there, since this is a console application. The IDE should have put a "pause" after the application terminated automatically, if it runs the app in new terminal window.

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    Yes, you can omit the getchar() in this case.

    Since scanf() leaves behind a newline char, in the keyboard buffer, it's a good habit to get into having a getchar() right after each newline - but it's not always necessary, when all you want scanf() to get, is a number. Char's are the BIG problem for scanf(), when a newline is in the keyboard buffer from a previous scanf().

    You may also use getchar() to hold the console window open, so you can read the output, before the console window disappears. Whether or not the console window will disappear at the end of your C program, is up to your OS, and/or IDE.

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    Quote Originally Posted by Xupicor View Post
    You could have read what the compiler said about it, it was quite clear
    You are correct, it was quite clear and I see that now. Sorry for being such a newb. My mistake!

  9. #9
    a guy with long hair Xupicor's Avatar
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    Nah, everyone was a newb at some point. You'll get familiar with compiler error messages, in time.

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