try yourself |run program

#include <stdio.h>
#include <conio.h>

void f1(){
 int a = 100;
 int b = 200;
 printf("\n value of a = %d",a);
 printf("\n value of b = %d",b);
}

void main(){
 clrscr();
 f1();
 getch();
}

Program Output

value of a = 100
value of b = 200