Program to print First Digit of Number using While loop
- Write a program to print First Digit of Number using While loop in C
- Write a program to print First Digit of Number using While loop in C++
- Write a program to print First Digit of Number using While loop in Python
- Write a program to print First Digit of Number using While loop in PHP
- Write a program to print First Digit of Number using While loop in Java
- Write a program to print First Digit of Number using While loop in Java Script
- Write a program to print First Digit of Number using While loop in C#
Explanation:
By continually dividing a number by 10 until only one digit is left, a for loop may be used to locate and print the number’s initial digit.
Logic
- Take input for the number (n).
- Handle cases where n is negative by taking its absolute value.
- Use a While loop to repeatedly divide n by 10.
- Stop the loop when n becomes less than 10.
- The remaining value of n is the first digit
Program to print First Digit of Number using While loop
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C
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C++
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Python
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PHP
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JAVA
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Java Script
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C#
#include <stdio.h> int main() { int num; printf("Enter a number: "); scanf("%d", &num); // Handle negative numbers if (num < 0) { num = -num; } // Extract first digit while (num >= 10) { num /= 10; } printf("First digit: %d\n", num); return 0; }
#include <iostream> using namespace std; int main() { int num; cout << "Enter a number: "; cin >> num; // Handle negative numbers if (num < 0) { num = -num; } // Extract first digit while (num >= 10) { num /= 10; } cout << "First digit: " << num << endl; return 0; }
<div class="contain-inline-size rounded-md border-[0.5px] border-token-border-medium relative bg-token-sidebar-surface-primary dark:bg-gray-950"><div class="overflow-y-auto p-4" dir="ltr"><code class="!whitespace-pre hljs language-python">num = int(input("Enter a number: ")) # Handle negative numbers if num < 0: num = -num # Extract first digit while num >= 10: num //= 10 print(f"First digit: {num}")
<?php $num = (int)readline("Enter a number: "); // Handle negative numbers if ($num < 0) { $num = -$num; } // Extract first digit while ($num >= 10) { $num = (int)($num / 10); } echo "First digit: $num\n"; ?>
import java.util.Scanner; public class FirstDigit { public static void main(String[] args) { Scanner sc = new Scanner(System.in); System.out.print("Enter a number: "); int num = sc.nextInt(); // Handle negative numbers if (num < 0) { num = -num; } // Extract first digit while (num >= 10) { num /= 10; } System.out.println("First digit: " + num); sc.close(); } }
let num = parseInt(prompt("Enter a number: ")); // Handle negative numbers if (num < 0) { num = -num; } // Extract first digit while (num >= 10) { num = Math.floor(num / 10); } console.log(`First digit: ${num}`);
using System; class Program { static void Main() { Console.Write("Enter a number: "); int num = int.Parse(Console.ReadLine()); // Handle negative numbers if (num < 0) { num = -num; } // Extract first digit while (num >= 10) { num /= 10; } Console.WriteLine($"First digit: {num}"); } }