Lex Program to remove comments from C program
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:
lex abc.l (abc is the file name) cc lex.yy.c -efl ./a.out
Let’s see LEX program to accept string starting with vowel.
Examples:
Input : //testing #includeint main() { /* multiline comment continue.... */ return 0; } Output : #include int main() { return 0; }
Below is the implementation:
/% Lex Program to remove comments from C program and save it in a file %/ /*Definition Section*/ %{ %} /*Rule Section*/ %% /*Regular expression for single line comment*/ \/\/(.*) {}; /*Regular expression for multi line comment*/ \/\*(.*\n)*.*\*\/ {}; %% /*Driver function*/ int main() { yyout=fopen("out.c","w"); yylex(); return 0; } |
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Output:
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