Write a Lex program to print out all numbers from the given file.

 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