C++ program to check Armstrong number
In this chapter of C++ program tutorial out task is:
-
Write a c++ program to check whether a number is armstrong number or not
C++ program to check Armstrong number
Given below is the c++ program to check armstrong number or not.
/* Program Name : To check whether a number is Armstrong or not
Program Author : Sayantan Bose
*/
#include<iostream>
//math.h header file is used for the sqrt function
#include <math.h>
using namespace std;
//This function will return the sum of the digits powered to the length of the inputed number.
int arms (int num)
{
int r,sum=0,num1=num,c=0;
while(num!=0)
{
c++;
num=num/10;
}
while(num1!=0)
{
r=num1%10;
num1=num1/10;
sum=sum+pow(r,c);
}
return sum;
}
// This is the main function
int main() {
int num,sum=0,new_num;
cout<<"Enter any number to check Armstrong:";
cin>>num;
new_num=num;
sum=arms(num);
if(sum==new_num)
cout<<sum<<" is an Armstrong number";
else
cout<<sum<<" is not an Armstrong number";
return 0;
}
OUTPUT
Enter the number to check Armstrong:
153
153 is an Armstrong number
Or
Enter the number to check Armstrong:
53
53 is not an Armstrong number
EXPLANATION :
In the above c++ program to check if a number is Armstrong or not:
-
A number is said to be Armstrong if and only if the sum of its digits powered to the length of the number is equal to the number itself.
-
For example: 153 is an Armstrong number. Because 153 can be written as the sum of 13+53+33, where 3 is the length of the provided number 153.
-
In the method arms, we are calculating the sum of each digit powered to the length of the inputed number. And then the sum is returned to the main method.
-
In the main method the sum is then compared with the original number provided as input.
-
If both of them turn out to be equal the number is an Armstrong number else it isn't.
āYou can see the above code execution and output in codeblocks IDE:
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About the Author
Sayantan Bose
- š Iām currently working on DS Algo skills
- š± Iām currently learning web develeopement
- šÆ Iām looking to collaborate with Oppia
- š« Reach me at https://www.linkedin.com/in/sayantan-bose-14134a1a6/
- š Pronouns: his/him
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Published Date :
Dec 07,2020