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C++

Global and Local Variables in C++

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

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Program Listing

variables.cpp

#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;
}

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