Local Variable

A variable that is declared inside the function or block is called local variable.

Example 1: Local varible

void show();
void main()
{
   int a=10; //Local variable
   printf("Value inside main function is:\n");
   printf("A = %d\n",a);
   void show();
   getch();
}
void show()
{
   int a=20; //Local variable
   printf("Value outside main function is:\n");
   printf("A = %d\n",a);
}

Reference variable

Reference variable refers to another variable, it does not occupy memory instead it refer to another variable. Any changes made to reference variable or refered variable, reflect to one another.

Example 2: Reference varible

void main()
{
    int a=10;
    int &b=a; //b is refered to a
    clrscr();
    printf("A=%d\n",a);
    printf("B=%d\n",b);
	
	a=20;
	printf("A=%d\n",a);
    printf("B=%d\n",b);
	
	b=30;
	printf("A=%d\n",a);
    printf("B=%d\n",b);
    getch();
}