Base 7 LeetCode solution in C++

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Method 1 : - -- -- -- -- -- -- -- -class Solution {
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 public:
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  string convertToBase7(int num) {
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    if (num < 0)
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      return "-" + convertToBase7(-num);
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    else if (num < 7)
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      return to_string(num);
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    else
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      return convertToBase7(num / 7) + convertToBase7(num % 7);
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  }
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};
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Method 2 : - -- -- -- -- -- -- -- -class Solution {
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 public:
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  string convertToBase7(int num) {
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    string res = "";
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    int num1 = num;
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    if (num == 0) return "0";
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    num = abs(num);
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    while (num > 0) {
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      res += to_string(num % 7);
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      num = num / 7;
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    }
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    reverse(res.begin(), res.end());
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    if (num1 < 0) res = "-" + res;
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    return res;
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  }
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};