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| class Solution {
public String convertToBase7(int num) {
if (num == 0) {
return "0";
}
boolean negative = false;
if (num < 0) {
negative = true;
num *= -1;
}
StringBuilder sb = new StringBuilder();
while (num != 0) {
sb.append(num % 7);
num /= 7;
}
String numStr = sb.reverse().toString();
return (negative ? "-" : "") + numStr;
}
}
|
注意 Java 中负数对正数取余的结果为负数，所以我们将 num 转换为正数后再处理。
References
504. Base 7