HDU 2024 - C语言合法标识符

#include#includeint main()
{
      int n,i,k,l;
      char a[50];
      scanf("%d",&n);
            getchar();
      
            while(n--)
            {
                  gets(a);
                  l=strlen(a);
                  k=0;
                  if((a[0]>='a'&&a[0]='A'&&a[0]<='Z')||a[0]=='_')
                              k++;
                  for(i=1;i='a'&&a[i]='A'&&a[i]='0'&&a[i]<='9'))
                              k++;
                  }
                  if(k==l)
                        printf("yesn");
                  else
                        printf("non");
            }
 }