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Lex program to check whether input number is odd or even

  • Last Updated : 30 Apr, 2019

Lex is a computer program that generates lexical analyzers. Lex reads an input stream specifying the lexical analyzer and outputs source code implementing the lexer in the C programming language.

The commands for executing the lex program are:

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lex abc.l (abc is the file name)
gcc lex.yy.c -ll
./a.out

Let’s see lex program to check whether input number is odd or even.

Examples:



Input : 
22
Output :
Input Number is Even

Input :
53
Output :
Input Number is odd

Below is the implementation:




/% Lex Program to check whether 
      - input number is odd or even. %/
  
% {
   int i;
% }
  
%%
[0-9]+ {i = atoi(yytext); 
  
if(i%2==0) 
 printf("Input Number is Even"); 
  
else 
 printf("Input Number is Odd");
};
  
%%
 int main()
  {
    yylex();
    return 1;
  }

Output:

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