Leetcode 65.Valid Number (valid numbers)

Valid number

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.

Update (2015-02-10):

The signature of the C + + function had been updated. If you still see your function signature accepts a const char * argument, please click the reload button to reset your co De definition.

Idea: This problem is really difficult, and most importantly, I do not know the rules of a valid number ... Not even the rules do not know how to play a good game, so decisive hanging 10 times 8 times, and finally did not fully correct. Temporarily put someone else's code out below, there is time to do a good study:

public class Solution {public Boolean isnumber (String s) {//Start typing your Java solution below//D O not write main () function/* "0" = "0.1" + true "abc" = FAL        Se "1 a" + = false "+-2e10" = True//*///check input.        if (S==null | | s.length () ==0) return false;        int sz = s.length ();                int i=0;                while (I<sz && s.charat (i) = = ") ++i;        Boolean space = false;        Boolean exp = false;        Boolean dot = false;        Boolean number = false;                Boolean neg = false;            for (; i<sz; i++) {char c = s.charat (i);            if (c== ") {space = true;            } else if (Space==true) {return false;                } else if ((c== ' e ' | | c== ' e ') && exp==false && number==true) {exp = true;                Number = false; Dot =True            Neg = false;                } else if (c== '. ' && dot==false) {dot = true;               Neg = true;            Number = false;            } else if (c>= ' 0 ' && c<= ' 9 ') {number = true;            } else if ((c== ' + ' | | c== '-') && neg==false && number==false) {neg = true;            } else {return false;    }} return number; }}

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Leetcode 65.Valid Number (valid numbers)