String to Integer (atoi)(java)
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mplement atoi to convert a string to an integer.
Hint: Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases.
Notes: It is intended for this problem to be specified vaguely (ie, no given input specs). You are responsible to gather all the input requirements up front.
本题注意点:
(1)空字符串(2)正负号(3)前后Space(4)正确计算(5)越界时候,返回最大和最小的值
public class Solution {
public int myAtoi(String str) {if(str==null||str.length()<1){
return 0;
}
//trim white space
str=str.trim();
char flag='+';
//check negative or positive
int i=0;
if (str.charAt(0)=='-'){
flag='-';
i++;
}else if(str.charAt(0)=='+'){
i++;
}
//use double to store result
double result=0;
//culculate value
while(str.length()>i&&str.charAt(i)>='0'&&str.charAt(i)<='9'){
result=result*10+str.charAt(i)-'0';
i++;
}
if(flag=='-'){
result=-result;
}
//handle max and min
if(result>Integer.MAX_VALUE){
return Integer.MAX_VALUE;
}
if(result<Integer.MIN_VALUE){
return Integer.MIN_VALUE;
}
return (int) result;
}
}
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