Armstrong Number in C

Armstrong Number in C

Before going to write the c program to check whether the number is Armstrong or not, let's understand what is Armstrong number.

Armstrong number is a number that is equal to the sum of cubes of its digits. For example 0, 1, 153, 370, 371 and 407 are the Armstrong numbers.
Let's try to understand why 153 is an Armstrong number.

153 = (1*1*1)+(5*5*5)+(3*3*3) 
where: 
(1*1*1)=1 
(5*5*5)=125 
(3*3*3)=27 
So: 
1+125+27=153 


/*   C Program to verify given no. is Armstrong or not */   
#include<stdio.h>
int main()
{
int n,r,sum=0,m;
printf("Enter a no:");
scanf("%d",&n);

m=n;
while(n>0)
{
r=n%10;
sum=sum+r*r*r;
n=n/10;
}

if(sum==m)
printf("Armstrong");
else

printf("Not Armstrong");
return 0;
}


INPUT/OUTPUT:
Enter a no:153
Armstrong

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