hdu2024C语言合法标识符

 1 #include<iostream>
 2 #include<stdio.h>
 3 #include<math.h>
 4 #include<stdlib.h>
 5 #include<string.h>
 6 #include<limits>
 7 using namespace std;
 8 
 9 int main()
10 {
11     //freopen("in.txt","r",stdin);
12     int n;
13     char a[60];
14     cin>>n;
15     getchar();
16     while(n--)
17     {
18         gets(a);
19         int flag=0;
20         for(int i=0;i<strlen(a);i++)
21         {
22             if(a[i]=='_' || (a[i]>='0' && a[i]<='9') || (a[i]>='A' && a[i]<='Z') || (a[i]>='a' && a[i]<='z') )
23             {
24                 if(i==0 && (a[i]>='0' && a[i]<='9'))
25                 {
26                     flag=1;
27                     break;
28                 }
29                 continue;
30             }
31             else
32             {
33                 flag=1;
34                 break;
35             }
36         }
37         if(flag)
38         cout<<"no"<<endl;
39         else
40         cout<<"yes"<<endl;
41     }
42     return 0;
43 }