HDU 2024 C语言合法标识符

 1 #include <ctype.h>

 2 #include <stdio.h>

 3 int main()

 4 {

 5     int n, d, i;

 6     char sym[64];

 7     scanf("%d%*c", &n);

 8     while (n--)

 9     {

10         gets(sym);

11         if (sym[0] != '_' && !isalpha(sym[0]))

12         {

13             puts("no");

14             continue;

15         }

16         for (d = i = 1 ; sym[i] ; i++)

17         {

18             if (!isalnum(sym[i]) && sym[i] != '_')

19             {

20                 d = 0;

21                 break;

22             }

23         }

24         puts(d ? "yes" : "no");

25     }

26     return 0;

27 }