%{
#include <stdio.h>
 
int lines = 0;    // To count the number of lines
int spaces = 0;   // To count the number of spaces
int tabs = 0;     // To count the number of tab characters
int others = 0;   // To count the number of other characters
%}
 
%%
\n              { lines++; }             // Count a new line
" "             { spaces++; }            // Count a space
"\t"            { tabs++; }              // Count a tab
.               { others++; }            // Count all other characters
 
%%
 
int main() {
    yylex(); // Call the Lex scanner
    // Print the results
    printf("The number of lines are: %d\n", lines);
    printf("The number of spaces are: %d\n", spaces);
    printf("The number of tab-meta characters are: %d\n", tabs);
    printf("The rest of the characters are: %d\n", others);
    return 0;
}
 

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Compiler Design Lab.