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a global variable can be accessed from any function in the program, a global variable is common to all functions

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//program to demonstrate global variables #include<stdio.h> #include<conio.h> int a=10; void print() { printf("\nvalue of a is %d",a); a++; } void main() { clrscr(); print(); a++; printf("\nvalue of a is %d",a); getch(); }