[剑指offer][面试题49]把字符串转换成整数（待完善）

int my_atoi(const char* p){assert(p!=NULL && *p!='\0');bool bNegtive = false;int  iResult  = 0;if(p[0] == '+' || p[0] == '-'){bNegtive = (*p++ != '+');}while(isdigit(*p)){iResult = iResult*10 + (*p++ - '0');}return bNegtive ? -iResult : iResult;}