leetcode-65. Valid Number
2016-12-13 19:44
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leetcode-65. Valid Number
题目:Validate if a given string is numeric.
Some examples:
“0” => true
” 0.1 ” => true
“abc” => false
“1 a” => false
“2e10” => true
Note: It is intended for the problem statement to be ambiguous. You should gather all requirements up front before implementing one.
这题就是需要考虑很多的情况.本身并不难.我也是试了很多次才AC。
基本思路就是分情况讨论。然后设定标志位来辅助判断。
public class Solution { public boolean isNumber(String s) { s = s.trim(); if(s.length()<1) return false; boolean e=false,p=false,prenumber=false,sign=false; for(int i = 0;i<s.length();i++){ if(s.charAt(i)=='-'||s.charAt(i)=='+'){ if(!sign && (i==0 || s.charAt(i-1)=='e' && i<s.length()-1 )) sign = true; else return false; }else if(s.charAt(i)=='.'){ if(s.length()!=1 && !p && !e) p = true; else return false; }else if(s.charAt(i)=='e'){ if(prenumber && !e && i<s.length()-1){ e = true; sign=false; } else return false; }else if(s.charAt(i)>='0' && s.charAt(i)<='9'){ if(!prenumber) prenumber=true; }else { return false; } } if(prenumber) return true; else return false; } }
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