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String to Integer (atoi)
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.
思路：
1 class Solution { 2 public: 3 int atoi( const char *str ) { 4 double ret = 0, sign = 1.0; 5 while( *str != ‘\0‘ && *str == ‘ ‘ ) { ++str; } 6 if( *str == ‘+‘ || *str == ‘-‘ ) { sign = *(str++) == ‘+‘ ? 1.0 : -1.0; } 7 while( *str >= ‘0‘ && *str <= ‘9‘ ) { 8 ret = 10*ret + sign*( *(str++)-‘0‘ ); 9 }10 if( ret > INT_MAX ) { return INT_MAX; }11 if( ret < INT_MIN ) { return INT_MIN; }12 return (int)ret;13 }14 };
String to Integer (atoi)
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