Bad palindrom, C++ (gcc)

Bad palindrom

//Title of this code

#include <iostream>
#include <string>

using namespace std;

bool isPalindrom(int num) {
  
    string str = to_string(num);
    
    int i = 0;
    int j = str.length() - 1;
    
    while (i < j) {
        if (str[i] != str[j])
            return false;
        
        ++i;
        --j;
    }
    
    return true;
}

int nextPalindrom(int n) {
    if (isPalindrom(n))
        return n;
    
    do {
        ++n;
    } while (!isPalindrom(n));
    
    return n;
}

int nextPalindrom2(int num) {

string str = to_string(num);
    
    int i = 0;
    int j = str.length() - 1;
    
    //cout << str << endl;
    
    while (i < j) {
        int a = str[i] - '0';
        int b = str[j] - '0';
        
        if (a != b) {
            if (a < b) {
                str[i] = (a + 1) + '0';
                str[j] = str[i];
                
                //cout << "anyad: " << str[i] << str[j] << endl;
                
                
            } else {
                //str[j] = (b - 1) + '0';
                //str[i] = str[j];
                str[j] = str[i];
            }
        }
        
        //str[j] = str[i];
        ++i;
        --j;
    }
    
    return atoi(str.c_str());
}

int main()
{
    
    //cout << 57 << " " << nextPalindrom(57) << " - " << nextPalindrom2(57) << endl;
    
    
    for (int i = 0; i < 9000; ++i)
        if (nextPalindrom(i) != nextPalindrom2(i))
            cout << i << " " << nextPalindrom(i) << " - " << nextPalindrom2(i) << endl;
    
    
    //std::cout << nextPalindrom2(9865);
}


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