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Implementation of LEXICAL ANALYZER for IF STATEMENT with the help of Lex Tool in CPP

 Implementation of  LEXICAL ANALYZER for IF STATEMENT with  the help of Lex  Tool in CPP-

Program-
#include<iostream>

#include<fstream>

#include<stdlib.h>

#include<string.h>

#include<ctype.h>

using namespace std;

int isKeyword(char buffer[]) {
  char keywords[32][10] = {
    "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"
  };
  int i, flag = 0;

  for (i = 0; i < 32; ++i) {
    if (strcmp(keywords[i], buffer) == 0) {
      flag = 1;
      break;
    }
  }

  return flag;
}

int main() {
  char ch, buffer[15], operators[] = "+-*/%=";
  ifstream fin("program.txt");
  int i, j = 0;

  if (!fin.is_open()) {
    cout << "error while opening the file\n";
    exit(0);
  }

  while (!fin.eof()) {
    ch = fin.get();

    for (i = 0; i < 6; ++i) {
      if (ch == operators[i])
        cout << ch << " is operator\n";
    }

    if (isalnum(ch)) {
      buffer[j++] = ch;
    } else if ((ch == ' ' || ch == '\n') && (j != 0)) {
      buffer[j] = '\0';
      j = 0;

      if (isKeyword(buffer) == 1)
        cout << buffer << " is keyword\n";
      else
        cout << buffer << " is indentifier\n";
    }

  }

  fin.close();

  return 0;
}
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Location: India

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