C++ Exercises: Check if a number is Authomorphic or not

Last update on April 12 2025 13:00:39 (UTC/GMT +8 hours)

24. Automorphic Number Check

Write a program in C++ to check if a number is Authomorphic or not.

Sample Solution:

C++ Code :

#include<iostream> // Including the input/output stream library
using namespace std; // Using the standard namespace

// Function to check if a number is an Automorphic Number
bool chkAutomor(int num1)
{
    int sqno = num1 * num1; // Computing the square of the input number
    while (num1 > 0) // Loop to check the digits
    {
        if (num1 % 10 != sqno % 10) // Checking the last digits
            return false; // If not equal, it's not an Automorphic Number
        num1 /= 10; // Move to the next digit in the input number
        sqno /= 10; // Move to the next digit in the square of the input number
    }
    return true; // If all digits match, it's an Automorphic Number
}

// Main function
int main()
{
    int auno; // Declaring variable to store user input

    cout << "\n\n Check whether a number is an Automorphic Number or not: \n"; // Displaying a message
    cout << " ------------------------------------------------------------\n";
    cout << " Input a number: ";
    cin >> auno; // Taking user input

    // Checking if the entered number is an Automorphic Number and displaying the result
    if( chkAutomor(auno))
        cout << " The given number is an Automorphic Number."<<endl;
    else
        cout << " The given number is not an Automorphic Number."<<endl;
    return 0; // Return 0 to indicate successful completion
}

Sample Output:

Check whether a number is an Authomorphic Number or not:                                            
 ------------------------------------------------------------                                        
 Input a number: 25                                                                                  
 The given number is an Automorphic Number.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C++ program to check if a number is automorphic by comparing its square's ending digits to itself.
Write a C++ program to verify automorphic numbers using string manipulation to compare endings.
Write a C++ program to determine automorphic numbers by iterating through candidate numbers and checking patterns.
Write a C++ program to test automorphic numbers with custom functions that extract the last digits of a square.

C++ Code Editor:

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