Lecture 39 :- Reverse Integer

To reverse an integer, you can write a C++ function that takes an integer as input and returns its reverse. The reverse of an integer is obtained by reversing the order of its digits. For example, the reverse of 123 is 321.

Here's a C++ program to reverse an integer:

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#include <iostream> int reverseInteger(int num) {    int reversed = 0;    while (num != 0) {        int digit = num % 10;        reversed = reversed * 10 + digit;        num /= 10;    }    return reversed; } int main() {    int num;    std::cout << "Enter an integer: ";    std::cin >> num;    int reversedNum = reverseInteger(num);    std::cout << "The reverse of " << num << " is: " << reversedNum << std::endl;    return 0; }

Example output:

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Enter an integer: 12345 The reverse of 12345 is: 54321

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Enter an integer: -789 The reverse of -789 is: -987

In the program, we define a function reverseInteger that takes an integer as input. Inside the function, we use a while loop to extract each digit of the input number from the least significant digit to the most significant digit. We reverse the digits by building the reversed number from right to left. The loop continues until the input number becomes 0. Note that the function also handles negative numbers correctly.

Feel free to run this program with different integers to reverse them and see the results.