字符串小技巧

31 char s[100];
32
33 int main() {
34     strcpy(s, "123");
35     cout << atoi(s) << endl;    //atol同atoi
36
37     strcpy(s, "12.3");
38     cout << atof(s) << endl;    //没有atolf
39
40     strcpy(s, "12345678987654321");
41     cout << atoll(s) << endl;
42
43     return 0;
44 }