Global and Local Variables in C++

Here is a simple program in C++ to show how to declare and use local and global variables.

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Program Listing

#include <iostream>

using namespace std;

int Displayg_var();

int Func1();

int Func2();

int g_var=0;

int main()

{

    Displayg_var();

                                          system("Pause");

    g_var=6;

                                          system("Pause");

    Displayg_var();

                                          system("Pause");

    Func1();

                                          system("Pause");

    Displayg_var();

                                          system("Pause");

    Func2();

    system("Pause");

    return 0;

}

int Displayg_var()

{

    cout<<"\n\nThe Value of v_gar now is: "<<g_var<<endl;

}

int Func1()

{

    g_var=3;

}

int Func2()

{

    int g_var;

    g_var=101;

    cout<<"\n\nThe value of g_var(local variable) inside Func2 is: "<<g_var<<endl;

}