首页 > 代码库 > 【Leet Code】String to Integer (atoi) ——常考类型题
【Leet Code】String to Integer (atoi) ——常考类型题
String to Integer (atoi)
Total Accepted: 15482 Total Submissions: 106043My SubmissionsImplement 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.
spoilers alert... click to show requirements for atoi.
字符串的操作,写程序经常性遇到,string这个类真的非常有用哟,题目要求自行实现atoi的功能:
class Solution { public: int atoi(const char *str) { while(' ' == *str) { str++; } bool isNegative = false; if('-' == *str) { isNegative = true; str++; } else if('+' == *str) { str++; } long long ret = 0; while(*str) { if( isdigit(*str) ) { ret = ret * 10 + (*str - '0'); if(isNegative && (-ret <= INT_MIN)) { return INT_MIN; } if(!isNegative && (ret >= INT_MAX)) { return INT_MAX; } } else { break; } str++; } return (isNegative ? -ret : ret); } };
【Leet Code】String to Integer (atoi) ——常考类型题
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。