Genarate a code for reversing the number (while loop)

#include <stdio.h> #include <conio.h> void main() { int num, rem, temp, rev; clrscr(); printf("Enter a number: "); scanf("%d", &num); while(num>0) { rem = num%10; temp = num/10; rev = rev*10+rem; num = temp; } printf("The reverse is: %d\n", rev); getch(); }

Output

Explanation of the Reverse Number Program

This program is designed to reverse a number entered by the user. It repeatedly extracts the last digit of the number and builds the reversed number step-by-step using a while loop.

The program uses the modulus operator (%) to separate digits and integer division to remove the last digit. Each digit is appended to the reversed number using the expression rev = rev * 10 + rem. However, the variable rev is not initialized, which can lead to incorrect output.

What the Program Does

• Asks the user to enter any positive number.
• Uses % 10 to extract the last digit of the number.
• Uses / 10 to remove the extracted digit.
• Builds a reversed number digit-by-digit.
• Repeats this process until the number becomes 0.
• Prints the reversed number as output.
• Uses getch() to pause the screen in Turbo C.

Example Input

Enter a number: 1 2 3 4

Example Output

The reverse is: 4 3 2 1

Summary: This program reverses a number by repeatedly extracting digits using the modulus operator and rebuilding them in reverse order. To work correctly, the variable rev must be initialized to 0.