Write a C/C++ program to simulate lexical analyzer for validating operators.

#include <stdio.h>

#include <string.h>

int main ()

{

     char arithmetic[5]={'+','-','*','/','%'};

     char relational[4]={'<','>','!','='};

     char bitwise[5]={'&','^','~','|'};

     char str[2]={' ',' '};

     printf ("Enter value to be identified: ");

     scanf ("%s",&str);

     int i;

     if(((str[0]=='&' || str[0]=='|') && str[0]==str[1]) || (str[0]=='!' && str[1]=='\0'))

     {

                 printf("\nIt is Logical operator");

     }

     for(i=0;i<4;i++)

     {

                 if(str[0]==relational[i]&&(str[1]=='='||str[1]=='\0'))

                 {

                             printf("\n It is releational Operator"); break;

                 }

     }

     for(i=0;i<4;i++)

     {

                 if((str[0]==bitwise[i] && str[1]=='\0') || ((str[0]=='<' || str[0]=='>') && str[1]==str[0]))

                 {         

                             printf("\n It is Bitwise Operator"); break;

                 }

     }

     if(str[0]=='?'    &&  str[1]==':') 

     printf("\nIt  is  ternary operator");

     for(i=0;i<5;i++)

     {

                 if((str[0]=='+' || str[0]=='-') && str[0]==str[1])

                 {

                             printf("\nIt is unary operator"); break;

                 }

                 else if((str[0]==arithmetic[i] && str[1]=='=') || (str[0]=='=' && str[1]==' '))

                 {

                             printf("\nIt is Assignment operator"); break;

                 }

                 else if(str[0]==arithmetic[i] && str[1]=='\0')

                 {

                             printf("\nIt is arithmetic operator"); break;

                 }

     }

     return 0;

}