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leetcode/myAtoi.java at master · wpande/leetcode · GitHub

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public class Solution {

public int myAtoi(String str) {

if(str==null || str.length()==0)

return 0;

boolean sign=true;

int idx=0;

for(int i=0;i<str.length();i++){

char c=str.charAt(i);

if(c>='0'&&c<='9'){

idx=i;

break;

}

if(c=='-'){

sign=false;

idx=i+1;

break;

}

if(c=='+'){

idx=i+1;

break;

}

if(c==' '){

idx=i+1;

}

else

return 0;

}

if(!(str.charAt(idx)>='0'&&str.charAt(idx)<='9'))

return 0;

long res=0;

for(int i=idx;i<str.length();i++){

char c=str.charAt(i);

if(c>='0'&&c<='9'){

res=res*10+(c-'0');

if(res>Integer.MAX_VALUE)

break;

}

else

break;

}

int tres=0;

if(res>Integer.MAX_VALUE||res<0){

if(sign)

return Integer.MAX_VALUE;

else

return Integer.MIN_VALUE;

}

else

tres=(int)res;

return sign?tres:-tres;

}

}

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