Print out all numbers from the given file in Lex Program.
Create first file Num.l or Num.lex , and Create Second file num.txt
Num.l
%{
#include <stdio.h>
%}
%%
[0-9]+ { printf("%s\n", yytext); }
.|\n ;
%%
int yywrap(void){}
int main(int argc, char*argv[])
{
yyin=fopen("num.txt","r");
yylex();
return 0;
}
INPUT :-
num.txt
1
2
3
4
5
6
7
8
9
0
OUTPUT
sunny@sunny-PC:~/Desktop$ flex num.l
sunny@sunny-PC:~/Desktop$ gcc lex.yy.c
sunny@sunny-PC:~/Desktop$ ./a.out
1
2
3
4
5
6
7
8
9
0
