Implement 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.
Update (2015-02-10): The signature of the C++ function had been updated. If you still see your function signature accepts a const char * argument, please click the reload button to reset your code definition.
程序代码：
int myAtoi(char* str) { char *p = str; int flag = 1; while(*p==' ') p++; if(*p=='-'||*p=='+') { flag = 1-2*(*p=='-'); p++; } int sum = 0; while(*p>='0'&&*p<='9') { if(sum>INT_MAX/10||(sum==INT_MAX/10&&*p-'0'>7)) { if(flag==-1) return INT_MIN; else return INT_MAX; } sum = sum *10 +*p-'0'; p++; } return sum*flag;}新闻热点
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