✅ C Program to Reverse a Number Using While Loop

#include <stdio.h>

int main() {
    int num, reversed = 0, remainder;

    printf("Enter a number: ");
    scanf("%d", &num);

    while(num != 0) {
        remainder = num % 10;          
        reversed = reversed * 10 + remainder; 
        num = num / 10;                
    }

    printf("Reversed number = %d", reversed);

    return 0;
}
  

📘 Explanation:

This program reverses a given number using a while loop. It extracts digits one by one from the end and rebuilds the number in reverse order.

• Take user input using scanf().
• Use num % 10 to extract the last digit.
• Multiply reversed number by 10 and add the extracted digit.
• Remove last digit using num = num / 10.
• Repeat until the number becomes 0.

This program is commonly asked in beginner coding interviews and programming exams.

🧾 Sample Output:

Enter a number: 1234
Reversed number = 4321
  

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📌 Hashtags:

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🔍 Search Description:

Learn how to reverse a number in C using while loop. Beginner-friendly program with step-by-step explanation and sample output.