hdu 2024 C语言合法标识符

C语言合法标识符

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)
Total Submission(s): 10155    Accepted Submission(s): 4235

Problem Description

输入一个字符串，判断其是否是C的合法标识符。

 

Input

输入数据包含多个测试实例，数据的第一行是一个整数n,表示测试实例的个数，然后是n行输入数据，每行是一个长度不超过50的字符串。

 

Output

对于每组输入数据，输出一行。如果输入数据是C的合法标识符，则输出"yes"，否则，输出“no”。

 

Sample Input

312ajffi8x_aff  ai_2

 

Sample Output

noyesno
#include <iostream>#include <cmath>#include <vector>#include <cstdio>#include <algorithm>#include <ctype.h>#include <string>using namespace std;vector<string> keyword;//这个是对关键字的定义，很多人丢失了 void PreProcess(){    keyword.push_back("auto");    keyword.push_back("break");    keyword.push_back("case");    keyword.push_back("char");    keyword.push_back("const");    keyword.push_back("continue");    keyword.push_back("default");    keyword.push_back("do");    keyword.push_back("double");    keyword.push_back("else");    keyword.push_back("enum");    keyword.push_back("extern");    keyword.push_back("float");    keyword.push_back("for");    keyword.push_back("goto");    keyword.push_back("if");    keyword.push_back("int");    keyword.push_back("long");    keyword.push_back("struct");    keyword.push_back("register");    keyword.push_back("return");    keyword.push_back("signed");    keyword.push_back("short");    keyword.push_back("sizeof");    keyword.push_back("static");    keyword.push_back("switch");    keyword.push_back("typedef");    keyword.push_back("union");    keyword.push_back("unsigned");    keyword.push_back("void");    keyword.push_back("volatile");    keyword.push_back("while");}inline bool Process(string temp){    if(!isalpha(temp[0]) && temp[0]!='_')        return false;    for(int i = 1;i < (int)temp.size();i++)        if(!isalpha(temp[i])&&!isalnum(temp[i])&&temp[i]!='_')            return false;    for(int j = 0;j < (int)keyword.size();j++)        if(temp == keyword[j])            return false;    /*if(temp.size() > 32)//我觉得在这里应该加上，但是加上后就会WA        return false;*/    return true;}int main(){    PreProcess();    int n;    char buff[56];    memset(buff,0,sizeof(buff));    while(cin>>n)    {        getchar();        int num = 0;        while(true && n != 0)//为了防止敲击仅仅敲击回车后的空输入        {            gets(buff);            string temp(buff);            if(temp != "")            {                num++;                if(Process(temp))                    cout<<"yes"<<endl;                else                    cout<<"no"<<endl;                if(num == n)                    break;            }        }    }    return 0;}