# C program to check a given number is Armstrong or not using function

## C program to check a given number is Armstrong or not using function

This page has a C program to check a given number is Armstrong or not using function. The Armstrong is a number which belongs to integer. Armstrong Number is also known as Pluperfect digital invariant or Narcissistic number. In general, n-digits Armstrong number is equal to the sum of nth power of all digits of the n-digits number. For Example . . . 153 and 1634 are Armstrong numbers. That is, 1*1*1*+5*5*5+3*3*3 = 153,  1*1*1*1+6*6*6*6+3*3*3*3+4*4*4*4=1634 and so that the both two numbers are Armstrong numbers. The below given C program is used to check a given number is Armstrong or not using function. Kindly check out the program to check a given number is Armstrong or not using function. The program to check Armstrong or not can be written in many ways.

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### Program to check any Armstrong number using function

#include<stdio.h>
int armstrong(int);
int main(){
int numb,sum,entr;
clrscr();
printf("\n Give an Integer number: \n");
scanf("%d",&numb);
entr = numb;
sum = armstrong(numb);
if(sum == entr)
printf("\n The Number %d is Armstrong ",entr);
else
printf("\n The Number %d is not Armstrong Number",entr);
getch();
return 0;
}

int armstrong(int n){
int nr, digits=0, i, rem, s=0, m=1;
nr=n;
while(nr>0){
nr = nr / 10;
digits +=1;
}
nr=n;
while(nr!=0){
rem = nr % 10;
nr = nr / 10;
for(i=1;i<=digits;i++){
m = m*rem;
}
s +=m;
m=1;
}
return(s);
}

Sample output:

Give an Integer number:  153

The Number  153  is Armstrong

Give an Integer number:  6074

The Number  6074  is not Armstrong Number