Armstrong number

Q. Write a program to check whether a number is a Armstrong number or not.

Ans.

Definition of Armstrong number: An Armstrong number of three digits is an integer such that the sum of the cubes of its digits is equal to the number itself.

In other word �A number is Armstrong if it is equal the sum of cube of its digits.�

Example of Armstrong number is 371 because according to definition cube of its digits  sum will be equal to number so

Armstrong number 371=(3)³+(7)³+(1)³

                 371=27+343+1

                 371=371

/*program to check whether a number is Armstrong or not*/

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

int main()

{

 int n,num,rem,sum=0;

 printf("Enter any number : ");

 scanf("%d", &num);

 for(n=num; n>=1; n=n/10)

 {

   rem=n%10;

   sum=sum+(rem*rem*rem);

 }

 if(num==sum)

    printf("Number is Armstrong number");

 else

    printf("Number is not Armstrong number");
 getch();

 return 0;

}

Output:-

Enter any number :254

Entered number is not Armstrong number

                   

Enter any number : 371

Entered number is Armstrong number

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