Maximum 69 number-Leetcode-Anujsoni.cpp

class Solution {
public:
    int maximum69Number (int num) {
        string s = to_string(num);
        for(int i=0;i<s.size();i++){
            if(s[i] == '6'){
                s[i] = '9';
                break;
            }
        }
        int res = stoi(s);
        return res;
    }
};