8

8 write a lex program to count the frequency of the given word in a file and length of the longest word in the file

%{
#include <stdio.h>
#include <string.h>

int word_count = 0;
int max_length = 0;
char target_word[50] = "example";
%}

%%
[a-zA-Z]+ {
    int len = strlen(yytext);
    if (len > max_length) {
        max_length = len;
    }
    if (strcmp(yytext, target_word) == 0) {
        word_count++;
    }
}

. ; /* ignore other characters */

%%

int main(int argc, char **argv) {
    if (argc < 2) {
        printf("Usage: %s filename\n", argv[0]);
        return 1;
    }
    yyin = fopen(argv[1], "r");
    if (yyin == NULL) {
        printf("Failed to open file %s\n", argv[1]);
        return 1;
    }
    yylex();
    printf("Frequency of \"%s\": %d\n", target_word, word_count);
    printf("Length of the longest word: %d\n", max_length);
    return 0;
}

flex 8.l
gcc lex.yy.c -o 8
8 8.txt

filename is 8.txt and 8.l

credits _Chatgpt