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WRITE A C PROGRAME TO FIND AMSTRONG NUMBER

#include<stdio.h>

int main()

{

  int n, n1, rem, num=0;

  printf("Enter a positive  integer value: ");

  scanf("%d", &n);

  n1=n;  while(n1!=0)

  {

                        rem=n1%10;

                        num+=rem*rem*rem;

                        n1=n1/10;

            }

            if(n==num)

            {

                        printf("%d is an Armstrong number",n);

            }

            else

                        printf("%d is not an Armstrong number",n);

}

OUTPUT

Enter a positive  integer value: 142

142 is not an Armstrong number

C PROGRAM TO DISPLAY PRIME NUMBERS BETWEEN TWO NUMBERS

#include<stdio.h>
void main()
{
  int a, b, i, j, flag;
  printf("Enter two numbers : ");
  scanf("%d %d", &a, &b);
  printf("Prime numbers between %d and %d are : ", a, b);
  for(i=a+1; i<b; ++i)
  {
      flag=0;
      for(j=2; j<=i/2; ++j)
      {
        if(i%j==0)
        {
          flag=1;
          break;
        }
      }
      if(flag==0)
        printf("%d ",i);
  }
  return 0;
}
OUTPUT
Enter two numbers :12
30
Prime numbers between 12 and 30 are : 13 17 19 23 29

C PROGRAM TO CHECK WETHER THE GIVEN NUMBER IS PRIME OR NOT

#include<stdio.h>
int main()
{
  int n, i, flag=0;
  printf("Enter a positive integer value : ");
  scanf("%d",&n);
  for(i=2;i<=n/2;++i)
  {
      if(n%i==0)
      {
          flag=1;
          break;
      }
  }
  if (flag==0)
      printf("%d is a prime number.",n);
  else
      printf("%d is not a prime number.",n);
  return 0;
}
OUTPUT
Enter a positive integer value : 8
8 is not a prime number

C PROGRAM TO FIND POWER OF A NUMBER

#include <stdio.h>
int main()
{
  int base, exp;
  long long int n=1;
  printf("Enter base value and exponent value : ");
  scanf("%d %d", &base, &exp);
  while (exp!=0)
  {
      n = n * base;
      --exp;
  }
  printf("Answer : %d", n);
}
OUTPUT
Enter base value and exponent value :5
8
Answer :390625

C PROGRAM TO REVERSE A GIVEN NUMBER

#include <stdio.h>
int main()
{
  int n, rvs=0, rem;
  printf("Enter an integer value : ");
  scanf("%d", &n);
  while(n!=0)
  {
     rem=n%10;
     rvs=rvs*10+rem;
     n=n/10;
  }
  printf("Reversed number : %d",rvs);
  return 0;
}

OUTPUT
Enter an integer value : 58
Reverse number : 85