atoi c++ 代码,python atoi函数

public static int atoi(String str){int sign = 0;int result=0;if ((str.toCharArray()[0]-'0') > 9 && str.toCharArray()[0] != '-'){return 0;}if ( str.toCharArray()[0] == '-'){sign = 1;}for (int i = sign; i < str.toCharArray().length; i++){if ((str.toCharArray()[i]-'0') > 9)break;result = (int) (result + (str.toCharArray()[i]-'0')*Math.pow(10, str.toCharArray().length-1-i));}int a = result;if (a < 0)return Integer.MAX_VALUE;if (sign == 1) result = result * -1;return result;}