/******** Name :- Md Firoz Islam ***********
University :- Northern University Bangladesh
********** Dhaka,Bangladesh ***************/
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define yes cout<<"YES"<<endl;
#define no cout<<"NO"<<endl;
#define faster ios::sync_with_stdio(false),cin.tie(NULL);
 
const char* keywords[32] = {
    "auto","break","case","char","const","continue","default",
    "do","double","else","enum","extern","float","for","goto",
    "if","int","long","register","return","short","signed",
    "sizeof","static","struct","switch","typedef","union",
    "unsigned","void","volatile","while"
};
 
const char *operators[] = {"+", "-", "*", "/", "%", "=", "==", "!=", ">", "<", ">=", "<=", "&&", "||", "++", "--"};
const char *separators[] = {",", ";", "(", ")", "{", "}", "[", "]"};
 
int isKeyword(const char buffer[]) {
    for(int i = 0; i < 32; ++i) {
        if(strcmp(keywords[i], buffer) == 0) {
            return 1;
        }
    }
    return 0;
}
 
int isOperator(char ch) {
    for(int i = 0; i < sizeof(operators) / sizeof(operators[0]); ++i) {
        if(ch == operators[i][0]) {
            if(strlen(operators[i]) > 1) {
                return 2;
            }
            return 1;
        }
    }
    return 0;
}
 
int isSeparator(char ch) {
    for(int i = 0; i < sizeof(separators) / sizeof(separators[0]); ++i) {
        if(ch == separators[i][0]) {
            return 1;
        }
    }
    return 0;
}
 
int main() {
    char ch, buffer[15];
    ifstream fp("Firoz.txt");
    int j = 0;
 
    if(!fp.is_open()) {
        cout << "Error opening the file" << endl;
        return 1;
    }
 
    while(fp.get(ch)) {
        if(isalnum(ch)) {
            buffer[j++] = ch;
        }
        else {
            if(j != 0) {
                buffer[j] = '\0';
                j = 0;
 
                if(isKeyword(buffer)) {
                    cout << buffer << " is a keyword" << endl;
                } else {
                    cout << buffer << " is an identifier" <<endl;
                }
            }
 
            if(isOperator(ch) == 1) {
                cout << ch << " is an operator" << endl;
                if(isOperator(ch) == 2) {
                    cout << "Multi-character operator detected" << endl;
                }
            }
 
            if(isSeparator(ch)) {
                cout << ch << " is a separator" << endl;
            }
        }
    }
 
    fp.close();
    return 0;
}
 

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