%{
#include <stdio.h>
#include <string.h>
 
#define MAXWORDS 1000
#define MAXLEN 50
 
char words[MAXWORDS][MAXLEN];
int count[MAXWORDS];
int nwords = 0;
 
void addword(char *w) {
    for (int i = 0; i < nwords; i++) {
        if (strcmp(words[i], w) == 0) {
            count[i]++;
            return;
        }
    }
    strcpy(words[nwords], w);
    count[nwords++] = 1;
}
%}
 
%%
[a-zA-Z]+   { addword(yytext); }
[ \t\n]+    { /* ignore whitespace */ }
.           { /* ignore other chars */ }
%%
 
int main() {
    yylex();
    printf("\n--- Histogram of Words ---\n");
    for (int i = 0; i < nwords; i++) {
        printf("%s : ", words[i]);
        for (int j = 0; j < count[i]; j++) printf("*");
        printf(" (%d)\n", count[i]);
    }
    return 0;
}
 
int yywrap() { return 1; }
 

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Hello world hello test test test hello