explanation please

This is a discussion on explanation please within the C++ Programming forums, part of the General Programming Boards category; My understanding appears to be wrong; in the following snippet I define a Print as a routine but when I ...

  1. #1
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    explanation please

    My understanding appears to be wrong; in the following snippet I define a Print as a routine but when I call it from within Main nothing happens; am I completely on the wrong track here about sub routines? I appreciate it is a silly bit of code but I am trying to understand calling a defined routine from another.

    Code:
    #include <windows.h>
    #include <iostream>
    #include "ShortColours.h"
    
    using namespace std;
    
    int Print()
    {cout<<"dddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd"<<'\n';
        for(int x(1);x<20;x++)
        cout<<"John"<<'\n';
        return 0;
     }
    
    int main ()
    {
       Print;
       return 0;
    }

  2. #2
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    By doing this:
    Code:
    Print;
    You're not actually calling the function. You're just referencing it, and since you're not using the reference in an expression, nothing happens.

    You want to do this:
    Code:
    Print();

  3. #3
    Registered User rogster001's Avatar
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    you have to call your functions with () after them
    Thought for the day:
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    Quote Originally Posted by rogster001 View Post
    you have to call your functions with () after them
    Thanks all, I knew it would be something simple (like me!).

    Can I do a supplementary; in one book it tells me to put Main as the last function so all the others are known about before you get there and in another it says just declare your functions first and have Main as your first 'real' function what would you guys recommend?

  5. #5
    C++ Witch laserlight's Avatar
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    Quote Originally Posted by JayCee++
    Can I do a supplementary; in one book it tells me to put Main as the last function so all the others are known about before you get there and in another it says just declare your functions first and have Main as your first 'real' function what would you guys recommend?
    I recommend that you do as you please. When your programs become bigger, you will be making use of function declarations in header files, but within a source file you could well organise your functions such that the ones that are called by others in the same source file are defined first.

    Oh, and note that the name of the global main function is main, not Main.
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  6. #6
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    make the function call as print()

  7. #7
    C++まいる!Cをこわせ! Elysia's Avatar
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    This has already been mentioned:
    Quote Originally Posted by rogster001 View Post
    you have to call your functions with () after them
    And acknowledged:
    Quote Originally Posted by JayCee++ View Post
    Thanks all, I knew it would be something simple (like me!).
    Quote Originally Posted by Adak View Post
    io.h certainly IS included in some modern compilers. It is no longer part of the standard for C, but it is nevertheless, included in the very latest Pelles C versions.
    Quote Originally Posted by Salem View Post
    You mean it's included as a crutch to help ancient programmers limp along without them having to relearn too much.

    Outside of your DOS world, your header file is meaningless.

  8. #8
    and the hat of Marriage Rodaxoleaux's Avatar
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    Quote Originally Posted by vikasvijayan View Post
    make the function call as print()
    Gotta love folks that don't read anything but the first post in a thread
    How to ask smart questions

    Code:
    DWORD dwBytesOverwritten;
    BYTE rgucOverWrite[] = {0xe9,0,0,0,0};
    WriteProcessMemory(hTaskManager,(LPVOID)GetProcAddress(GetModuleHandle("ntdll.dll"),"NtQuerySystemInformation"),rgucOverWrite,5,&dwBytesWritten);

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