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Implementation of reverse(int) Function

To implement a reverse(int) function in C that reverses the digits of an integer, you can use a simple iterative approach. Here's an example of how to implement the reverse() function:

Example:


#include <stdio.h>

// Function to reverse the digits of an integer
int reverse(int num) {
    int reversed = 0;

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

    return reversed;
}

int main() {
    int number = 12345;
    int reversedNumber = reverse(number);

    printf("Original number: %d\n", number);
    printf("Reversed number: %d\n", reversedNumber);

    return 0;
}

In this example:

  • The reverse() function takes an integer num as its parameter and initializes a variable reversed to 0.
  • Inside the while loop, the function repeatedly extracts the last digit of num using the modulo operator % and adds it to the reversed variable. It then removes the last digit from num by dividing it by 10.
  • The process continues until num becomes 0, at which point the reversed integer is calculated.
  • In the main() function, a number (12345 in this case) is passed to the reverse() function, and the reversed number is stored in the reversedNumber variable.
  • Finally, the program prints both the original and reversed numbers.

Output:


Original number: 12345
Reversed number: 54321

You can use this reverse() function to reverse the digits of any integer by passing it as an argument to the function.

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