C++ Exercises: Find the first and last digit of a number

Last update on April 07 2025 13:01:12 (UTC/GMT +8 hours)

56. First and Last Digits of a Number

Write a program in C++ to find the first and last digits of a number.

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Sample Solution:

C++ Code :

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

int main() // Main function where the execution of the program starts
{
    int n, first, last; // Declare integer variables n, first, and last

    // Display message asking for input
    cout << "\n\n Find the first and last digit of a number:\n";
    cout << "-----------------------------------------------\n";
    cout << " Input any number: ";
    cin >> n; // Read input for the number from the user

    first = n; // Assign the input number to the variable 'first'
    last = n % 10; // Calculate the last digit of the number

    for (first = n; first >= 10; first = first / 10); // Loop to find the first digit of the number

    // Display the first and last digit of the number
    cout << " The first digit of " << n << " is: " << first << endl;
    cout << " The last digit of " << n << " is: " << last << endl;
}

Sample Output:

 Find the first and last digit of a number:                            
-----------------------------------------------                        
 Input any number: 5679                                                
 The first digit of 5679 is: 5                                         
 The last digit of 5679 is: 9 

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C++ program to extract and print the first and last digits of an input number using loops.
• Write a C++ program that converts a number to a string and prints the first and last characters as digits.
• Write a C++ program to find the first digit by repeatedly dividing the number and the last digit using modulus.
• Write a C++ program that reads an integer and outputs its first and last digits, using both arithmetic and string conversion methods.

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