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1. Introduction
Reversing a number is a frequent operation in computing. For instance, checking for palindromic numbers requires the number and its reverse to be compared. In this guide, we'll understand how to write a C program that can reverse a given number.
2. Program Overview
Our program will:
1. Ask the user to input a number.
2. Reverse the entered number.
3. Display the reversed number to the user.
3. Code Program
#include <stdio.h> // Integrate the Standard I/O library for necessary input-output functions
int main() { // Program initiation with the main function
int n, reversedNumber = 0, remainder; // Declare the original number, its reversed form, and a variable for the remainder
// Request the user for a number
printf("Enter an integer: ");
scanf("%d", &n); // Read the entered number
while (n != 0) {
remainder = n % 10; // Extract the last digit
reversedNumber = reversedNumber * 10 + remainder; // Add the extracted digit to the reversed number
n /= 10; // Reduce n by one digit
}
printf("Reversed Number = %d\n", reversedNumber); // Display the reversed number
return 0; // Signify successful completion
}
Output:
Enter an integer: 12345 Reversed Number = 54321
4. Step By Step Explanation
1. #include <stdio.h>: This line includes the standard input and output library, allowing us to use input and output functions.
2. int main(): This is where our program starts.
3. Variable Declaration:
- n: Stores the user's number.
- reversedNumber: Will store the reverse of the number.
- remainder: Helps in extracting the last digit from the number.
4. User Input: The program prompts the user to input a number and then captures it in n.
5. The Reversal Process:
- A while loop runs as long as n is not zero.
- Within the loop:
- We use the modulus operation (%) to get the last digit of n and store it in the remainder.
- We multiply the current reversedNumber by 10 and add the remainder to it. This effectively appends the last digit of n to the reverse.
- We then divide n by 10 (using /=) to drop its last digit.
- This process continues until all digits are processed, and we obtain our reversed number.
6. Output: The program then showcases the reversed number.
The strategy utilized here highlights the importance of loop constructs and basic arithmetic operations in solving problems effectively.
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