text:    #include<stdio.h>
  int main(){
      int y,x = 10;
      int *p,*q;
  
  
      p=&x;
      q=&y;
      *p=15;
      *q=20;
  
  
      printf("value of x=%d\n", x);
      printf("value of x=%d\n", y);
      printf("value of x=%d\n", *p);
      printf("value of x=%d\n", *q);
  
  }
  