#include<stdio.h>
int main(){
  int pow,num;
  long int res;
  long int power(int,int);
  printf("\nEnter a number: ");
  scanf("%d",&num);
  printf("\nEnter power: ");
  scanf("%d",&pow);
  res=power(num,pow);
  printf("\n%d to the power %d is: %ld",num,pow,res);
  return 0;
}
  int i=1;
  long int sum=1;
  long int power(int num,int pow){
      if(i<=pow){
           sum=sum*num;
          power(num,pow-1);
      }
      else
      return sum;
  }

#include<stdio.h>
int main(){
  int *ptr = 0;
  ptr++;
  printf("Size of int data type:  %d",ptr);
  return 0;
}

#include<stdio.h>
int main(){
  double *ptr = 0;
  ptr++;
  printf("Size of double data type:  %d",ptr);
  return 0;
}

#include<stdio.h>
struct student{
    int roll;
    char name[100];
    float marks;
};

int main(){
  struct student *ptr = 0;
  ptr++;
  printf("Size of the structure student:  %d",ptr);
  return 0;
}

#include<stdio.h>
union student{
    int roll;
    char name[100];
    float marks;
};

int main(){
  union student *ptr = 0;
  ptr++;
  printf("Size of the union student:  %d",ptr);
  return 0;
}