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a global variable can be accessed from any function in the program, a global variable is common to all functions
if a local and global varaible has the name name as in the code below(local and global variable is declared with name a)
global variable can be accessed using (::) scope resolution operator

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//program to create local and global variable with the same name and use scope resolution operator(::) to access global variable #include<iostream.h> #include<conio.h> int a=10; void main() { int a=15; clrscr(); cout<<"\nvalue of local variable a is "<<a; cout<<"\nvalue of global variable a is "<<::a; getch(); }