To Check Strong Number

 

 

Definition of strong number:

A number is called strong number if sum of the factorial of its digit is equal to number itself. For example: 145 since

1! + 4! + 5! = 1 + 24 + 120 = 145

 

 

 

Code 1:

1. Write a c program to check whether a number is strong or not

#include<stdio.h>

int main(){

  int num,i,f,r,sum=0,temp;

  printf("Enter a number: ");

  scanf("%d",&num);

 

  temp=num;

  while(num){

      i=1,f=1;

      r=num%10;

      while(i<=r){

         f=f*i;

        i++;

      }

      sum=sum+f;

      num=num/10;

  }

  if(sum==temp)

      printf("%d is a strong number",temp);

  else

      printf("%d is not a strong number",temp);

  return 0;

}

Sample output:

Enter a number: 145

145 is a strong number

 

Code 2:

 

1. C program for strong number

2. Strong number program in c

#include<stdio.h>

int main(){

  int num,i,f,r,sum,temp;

  int min,max;

  printf("Enter minimum range: ");

  scanf("%d",&min);

  printf("Enter maximum range: ");

  scanf("%d",&max);

  printf("Strong numbers in given range are: ");

  for(num=min; num <= max; num++){

      temp = num;

      sum=0;

      while(temp){

           i=1;

           f=1;

           r=temp%10;

           while(i<=r){

             f=f*i;

             i++;

           }

         sum=sum+f;

         temp=temp/10;

      }

        

      if(sum==num)

           printf("%d ",num);

  }

  return 0;

}

Sample output:

Enter minimum range: 100

Enter maximum range: 100000

Strong numbers in given range are: 145 40585