The below program checks for an Armstrong number using a loop. The C printf statement is used to output the result on the screen. A number is called as an Armstrong number if the sum of the cubes of its digits is equal to the number itself.
Armstrong Number: abc = (a*a*a) + (b*b*b) + (c*c*c)
Example: 0, 1, 153, 371, 407, etc.
C program to check for an Armstrong number
#include <stdio.h> void main() { int num,x; int sum = 0; printf("Enter a number:"); scanf("%d",&num); int i = num; while(i!=0) { x = i%10; sum= sum + x*x*x; i = i/10; } if(num==sum) { printf ("%d is an Armstrong Number.", num); } else { printf ("%d is not an Armstrong Number.", num); } } |
Output
Enter a number:407 407 is an Armstrong Number. |
