Check Armstrong Number using C program

/* C program to check whether a number is armstrong or not */
 
#include <stdio.h>
 
int main()
{
    int number, sum=0, rem=0,tempNumber;
 
    printf("Enter an integer number: ");
    scanf("%d", &number);
 
    tempNumber=number;
 
    while(tempNumber!=0)
    {
        rem=tempNumber%10;
        sum=sum + (rem*rem*rem);
        tempNumber/=10;
    }  
 
/* checking number is armstrong or not */ 
    if(sum==number)  
        printf("%d is an Armstrong number.",number);
    else
        printf("%d is not an Armstrong number.",number);
 
    return 0;
}

Using User Define Function

/* C program to check whether a number is armstrong or not */
 
#include <stdio.h>
 
/*function to check Armstrong Number*/
int isArmstrong(int num)
{
    int tempNumber=num;
    int rem,sum;
     
    /*sum of digit's cube*/
    sum=0;
    while(tempNumber!=0)
    {
        rem=tempNumber%10;
        sum=sum + (rem*rem*rem);
        tempNumber/=10;
    }  
     
    if(sum==num)
        return 1;   /*Armstrong Number*/
    else
        return 0;   /*Not an Armstrong Number*/
}
 
int main()
{
  int number;
  
  printf("Enter an integer number: ");
  scanf("%d", &number);
  
    if(isArmstrong(number))
        printf("%d is an Armstrong number.",number);
    else
        printf("%d is not an Armstrong number.",number);
  
  return 0;
}

Output:

    First run:
    Enter an integer number: 153
    153 is an Armstrong number.

    Second run:
    Enter an integer number: 167
    167 is not an Armstrong number.