C Program For Local vs Global Variables

Program 1

#include<stdio.h>
#include<conio.h>
void xyz();
void abc();
int a=30;
void main()
{
      int a=100;
        a=a+10;
        xyz();
    printf(" \nLocal Main: %d",a);
}
void xyz()
{
 a=a+10;
 abc();
 printf("\nGobal Value: %d",a);
 a=a+30;
}
void abc()
{
    int a=80;
    a=a+20;
    printf("\nLocal abc Value: %d",a);
    a=a-10;

}