C program to print Armstrong numbers from 1 to 500

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C program to print Armstrong numbers from 1 to 500

#include<stdio.h>

int main(){

    int num,r,sum,temp;

    for(num=1;num<=500;num++){

         temp=num;

         sum = 0;

         while(temp!=0){

             r=temp%10;

             temp=temp/10;

             sum=sum+(r*r*r);

         }

         if(sum==num)

             printf("%d ",num);

    }

    return 0;

}

Output:

1 153 370 371 407

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Algorithm:

Definition according to c programming point of view:

Armstrong numbers are those unique integers for which the sum of the cubes of their individual digits equals the original number itself.

 For example 153 since 1^3 + 5^3 + 3^3 = 1+ 125 + 9 =153

Other Armstrong numbers: 370,371,407 etc.

In general definition:

Armstrong numbers are defined as integers for which the sum of each digit raised to the power of the total number of digits in the number equals the original number itself.

Example 1: 153

Total digits in 153 is 3

And 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153

Example 2: 1634

Total digits in 1634 is 4

And 1^4 + 6^4 + 3^4 +4^4 = 1 + 1296 + 81 + 64 =1634

Examples of Armstrong numbers: 1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407, 1634, 8208, 9474, 54748, 92727, 93084, 548834, 1741725

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