[Get a random word from wordnet] #c

randstr.c

// sudo apt update && apt install wordnet-dev
#include <stdio.h>
#include <stdlib.h>

char *pickword(char *file)
{
    FILE *fp = fopen(file, "r");
    if (!fp) perror(file), exit(1);
    fseek(fp, 0, SEEK_END);
    long end = ftell(fp);
    if (RAND_MAX < end) puts("RAND_MAX too small"), exit(1);
    int c;
    do
        fseek(fp, rand()%end, SEEK_SET),
        fscanf(fp, "%*[^\n]%*c"),           // skip partial line
        c = getc(fp);
     while (c <= ' ');                      // header lines start with space
    ungetc(c, fp);
    static char word[72];
    fscanf(fp, "%71s", word);
    fclose(fp);
    return word;
}

int main()
{
  srand(time(NULL));
    puts(pickword("/usr/share/wordnet/index.noun"));
    puts(pickword("/usr/share/wordnet/index.verb"));
    puts(pickword("/usr/share/wordnet/index.adv"));
    puts(pickword("/usr/share/wordnet/index.adj"));
}