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;
}