Reverse the digits of a given int - C++ Data Structure

C++ examples for Data Structure:Algorithm

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Description

Reverse the digits of a given int

Demo Code

#include <iostream>

int reverseDigits(int);

int main(int argc, const char *argv[]) {
    int n;/*from   w  ww.  j  a  v  a 2s . co  m*/


    std::cout << "Enter a number to be reversed: ";
    std::cin >> n;

    std::cout << "\n" << reverseDigits(n) << std::endl;
    return 0;
}
// returns a reversed integer
int reverseDigits(int n) {
    int tmp = 0;
    int digits = 1;

    // get number of digits
    for (int d = 1; d <= n; d *= 10) {
        digits *= 10;
    }

    while (n != 0) {
        // reduce digits before using (avoid multiplying final value)
        digits /= 10;
        tmp += n % 10 * digits;

        n /= 10;
    }
    return tmp;
}

Result


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