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504. Base 7

Description

Given an integer num, return a string of its base 7 representation.

 

Example 1:

Input: num = 100
Output: "202"

Example 2:

Input: num = -7
Output: "-10"

 

Constraints:

• -107 <= num <= 107

Solutions

• Java
• C++
• Python
• Go
• TypeScript
• RenderScript

• class Solution {
      public String convertToBase7(int num) {
          if (num == 0) {
              return "0";
          }
          if (num < 0) {
              return "-" + convertToBase7(-num);
          }
          StringBuilder sb = new StringBuilder();
          while (num != 0) {
              sb.append(num % 7);
              num /= 7;
          }
          return sb.reverse().toString();
      }
  }
  
  

• class Solution {
  public:
      string convertToBase7(int num) {
          if (num == 0) return "0";
          if (num < 0) return "-" + convertToBase7(-num);
          string ans = "";
          while (num) {
              ans = to_string(num % 7) + ans;
              num /= 7;
          }
          return ans;
      }
  };
  

• class Solution:
      def convertToBase7(self, num: int) -> str:
          if num == 0:
              return '0'
          if num < 0:
              return '-' + self.convertToBase7(-num)
          ans = []
          while num:
              ans.append(str(num % 7))
              num //= 7
          return ''.join(ans[::-1])
  
  

• func convertToBase7(num int) string {
  	if num == 0 {
  		return "0"
  	}
  	if num < 0 {
  		return "-" + convertToBase7(-num)
  	}
  	ans := []byte{}
  	for num != 0 {
  		ans = append([]byte{'0' + byte(num%7)}, ans...)
  		num /= 7
  	}
  	return string(ans)
  }
  

• function convertToBase7(num: number): string {
      if (num == 0) {
          return '0';
      }
      let res = '';
      const isMinus = num < 0;
      if (isMinus) {
          num = -num;
      }
      while (num != 0) {
          const r = num % 7;
          res = r + res;
          num = (num - r) / 7;
      }
      return isMinus ? '-' + res : res;
  }
  
  

• impl Solution {
      pub fn convert_to_base7(mut num: i32) -> String {
          if num == 0 {
              return String::from("0");
          }
          let mut res = String::new();
          let is_minus = num < 0;
          if is_minus {
              num = -num;
          }
          while num != 0 {
              res.push_str((num % 7).to_string().as_str());
              num /= 7;
          }
          if is_minus {
              res.push('-');
          }
          res.chars().rev().collect()
      }
  }
  
  

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