Scope of variable in C Language | Local variable in C Language | Global variable in C Language

Scope is the lifetime of variables. Variables have two types depending upon scope.

• Local variable
• Global variable

 a.  Local variable in  C Language

Variable declared inside a function body is called local variable. It can exist only within the function in which it is declared.

 b. Global variable in  C Language

Variable declared before all function definitions is known as global variable. The value of global variable exists throughout the program. Changes made to them have effect on entire .

#include<stdio.h>
int k=10; /*global variable*/
void show()
{
  printf(“\nGlobal variable within show() %d”,k);
  k++;
}
int main()
{
  int k=50; /*Local variable*/
  printf(“Local variable in main=%d”,k);
  printf(“Global variable in main()=%d”,k);
  ++k;
  show();
  printf(“Global variable in main()=%d”,k);
  return(0);
}

Local variable in main=50
Global variable in main() =10
Global variable in function a=11
Global variable in main() a=12