C++ program to check a Peterson number
In this chapter of C++ program tutorial out task is:

write a c++ program to check whether a number is peterson number or not
C++ program to check a number is Peterson number or not
Below is the C++ program to check if a number is Peterson number or not.
/* Program Name : To check whether a number is Peterson or not
Program Author : Sayantan Bose
*/
#include <iostream>
#include <math.h>
using namespace std;
//This function will return the sum of the factorials of each digit of the inputed number.
int peter(int num)
{
int r,sum=0,f=1,i;
while(num!=0)
{
r=num%10;
for(i=1;i<=r;i++)
f=f*i;
sum=sum+f;
f=1;
num=num/10;
}
return sum;
}
// This is the main function
int main() {
int num,sum=0;
cout<<"Enter any number to check Peterson:\n";
cin>>num;
int new_num;
new_num=num;
sum=peter(num);
if(sum==new_num)
cout<<num<<" is a Peterson number";
else
cout<<num<< " is not a Peterson number";
return 0;
}
OUTPUT
Enter the number to check Peterson:
145
145 is an Peterson number
Or
Enter the number to check Peterson:
53
53 is not an Peterson number
EXPLANATION :
In the above c++ program to check if a number is Peterson or not:

A number is said to be Peterson if and only if the sum of the factorial of each digit of the number is equal to the number itself.

For example: 145 is a Peterson number. Because 145 can be written as the sum of 1!+4!+5!, is equal to 145 which is the number itself.

In the method peter, we are calculating the sum of the factorial of each digit of the 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 a Peterson number else it isn't.
You 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/sayantanbose14134a1a6/
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Published Date :
Dec 11,2020