Algo #122 : ATOI

Problem Statement : 
        Implement atoi to convert string into integer.

Solution : 

Below is atoi implementation.

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public static int atoi(String in) { int radix = 10; int limit = Integer.MAX_VALUE; int multiplicationLimit = limit / radix; if(in==null || (in=in.trim()).equals("")) return 0; int result=0, i =0 , len = in.length(); boolean isPositive=true; if (in.charAt(0) == '-') { i++; isPositive = false; } else if (in.charAt(0) == '+') i++; while(i<len){ char c = in.charAt(i++); if(c >= '0' && c <= '9') { int digit = (c - '0'); if(result < multiplicationLimit) result = result * radix + digit; else //result overflowing { if(isPositive) return Integer.MAX_VALUE; else return Integer.MIN_VALUE; } } else break; } if(!isPositive) result=-result; return result; } public static void main(String[] args) { System.out.println(atoi(" -88297 248252140B12 37")); System.out.println(atoi(" 75 6 ")); System.out.println(atoi("+349A756")); }

Please post comments and suggestions if any.
Happy Coding !! :)