Lex program that takes input from user specified file and labels each input as Integer, Float, Exponential or Other

%{

#include<stdio.h>

%}

%%

  /*** Rules section ***/

[-0-9]* {

    printf("Integer Value");

  }

^[-|0-9][0-9]+(.)[0-9]+ {

  printf("Float Value");

  }

[-0-9]*(.)[0-9]+(E)[-0-9]+ {

  printf("Exponential Value");

}

.* {

    printf("Invalid value");

  }

%%

int main()

{

  FILE *fp;

  fp = fopen("test1.txt", "r");

  if (fp == NULL) { printf("File not found"); }

  yyin = fp;

  yylex();

  return 0;

}

ScreenShot: