sdut 2163:Identifiers（第二届山东省省赛原题，水题）

Identifiers

Time Limit: 1000ms   Memory limit: 65536K  有疑问？点这里^_^

题目描述

 Identifier is an important concept in the C programming language. Identifiers provide names for several language elements, such as functions, variables, labels, etc.

An identifier is a sequence of characters. A valid identifier can contain only upper and lower case alphabetic characters, underscore and digits, and must begin with an alphabetic character or an underscore. Given a list of chararcter sequences, write a program to check if they are valid identifiers.

输入

 The first line of the input contains one integer, N, indicating the number of strings in the input. N lines follow, each of which contains at least one and no more than 100 characters. (only upper and lower case alphabetic characters, digits, underscore (" "), hyphen ("-"), period ("."), comma (","), colon (":"), semicolon (";"), exclamation mark ("!"), question mark ("?"), single and double quotation marks, parentheses, white space and square brackets may appear in the character sequences.)

输出

For each of the N lines, output "Yes" (without quote marks) if the character sequence contained in that line make a valid identifier; output "No" (without quote marks) otherwise.

示例输入

7

ValidIdentifier

valid_identifier

valid_identifier

0_invalid_identifier

1234567

invalid identifier

adefhklmruvwxyz12356790_-.,:;!?'"()[]ABCDGIJLMQRSTVWXYZ

示例输出

Yes

Yes

Yes

No

No

No

No

提示

 

来源

山东省第二届ACM大学生程序设计竞赛

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　　水题。

　　代码：

 1 #include <iostream>

 2 #include <stdio.h>

 3 using namespace std;  4 

 5 int main()  6 {  7     int i,j,n;  8     cin>>n;  9  getchar(); 10     for(i=1;i<=n;i++){ 11         char a[110]; 12         cin.getline(a,110,'\n'); 13         if(('a'<=a[0] && a[0]<='z') || ('A'<=a[0] && a[0]<='Z') || a[0]=='_'){ 14             for(j=0;a[j];j++) 15                 if(!(('a'<=a[j] && a[j]<='z') ||

16                      ('A'<=a[j] && a[j]<='Z') ||

17                      ('0'<=a[j] && a[j]<='9') ||

18                      a[j]=='_') ) 19                      break; 20             if(a[j]) 21                 cout<<"No"<<endl; 22             else

23                 cout<<"Yes"<<endl; 24  } 25         else

26             cout<<"No"<<endl; 27  } 28     return 0; 29 } 30 

31 /************************************** 32  Problem id : SDUT OJ 2163 33  User name : Miracle 34  Result : Accepted 35  Take Memory : 452K 36  Take Time : 0MS 37  Submit Time : 2014-04-20 09:18:49 38 **************************************/

 

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