Question

How to reverse an integer number in C++

Answer 1

#include <iostream>

int main(void) {
    int num = 893651;   
    int is_positive = 1;
         
    if (num < 0) {
        is_positive = -1;
        num = num * -1;
    }
         
    int reverse = 0;
    while (num > 0) {
        int remainder = num % 10;
        reverse = reverse * 10 + remainder;
        num /= 10;
    }
         
    if (is_positive == -1)
        reverse = reverse * -1;
         
    std::cout << reverse;
}



/*
run:

156398

*/

 

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