[2011山东ACM省赛] Identifiers(模拟)
2014-04-21 21:25
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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解题思路:
判断是否输入的字符串为合法标识符。
代码:
#include <iostream> #include <stdio.h> #include <string.h> #include <ctype.h> using namespace std; string str[1000]; int main() { int n;cin>>n; getchar();//必须得加这个,吸收空格,否则后面用getline会出错 for(int i=1;i<=n;i++) { getline(cin,str[i]); bool ok=1; int len=str[i].length(); if(!isalpha(str[i][0])&&str[i][0]!='_')//首字母不是字母也不是下划线 { cout<<"No"<<endl; continue; } for(int j=0;j<len;j++) { if(!isdigit(str[i][j])&&!isalpha(str[i][j])&&str[i][j]!='_')//不符合要求 { ok=0; break; } } if(ok) cout<<"Yes"<<endl; else cout<<"No"<<endl; } return 0; }
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- [2011山东省第二届ACM大学生程序设计竞赛]——Identifiers