06: valid C identifier, 06 identifier

06: valid C identifier, 06 identifier
06: Legal C identifier

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Total time limit:

1000 ms

Memory limit:

65536kB

Description

.

C language identifier requirements:

1. Non-reserved words;

2. Only letters, numbers, and underscores (_) are allowed.

3. Do not start with a number.

Input

A line that contains a string. The string does not contain any blank characters and cannot exceed 20 characters.

Output

A row. If it is a valid identifier of the C language, yes is output; otherwise, no is output.

Sample Input

RKPEGX9R;TWyYcp

Sample output

no

Source

Introduction to computing of Peking University 06 psychological and Information Management Final Examination

 1 #include<iostream> 2 #include<cstdio> 3 #include<cstring> 4 using namespace std; 5 char a[10001]; 6 int main() 7 { 8     gets(a); 9     int l=strlen(a);10     int flag=0;11     12         for(int i=0;i<l;i++)13         {    14         if(i==0)15             {16             if(a[0]>=48&&a[0]<=57)17                 {        18                     cout<<"no";19                     return 0;20                 }21             }22             if((a[i]==95)||(a[i]>=48&&a[i]<=57)||(a[i]>=65&&a[i]<=90)||(a[i]>=97&&a[i]<=122))23             flag=0;24             else flag=1;25             if(flag==1)26             {27                 cout<<"no";28                 return 0;29             }else continue;30         }31     32     cout<<"yes";33     return 0;34 }