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A nice example of C programming. Getting a random number in milliseconds.

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This is an interesting version of my random monster program. I added a simple function to get a random number in milliseconds.

randommonster.c
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#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <inttypes.h>
 
char *cuserid(char *s);
 
const char* x[] = {
    "Baron of Hell", "Demon", "Hellknight",
    "Cyberdemon", "Mancubus", "Revenant",
    "Heretic Imp", "Zombieman", "Sergeant",
    "Beholder", "Moloch", "Satyr",
    "Afrit", "Ettin", "Maulator",
    "Hectebus","Cacodemon","SabreClaw"
};
 
int64_t milliseconds() /* Getting the time in milliseconds. */
{
    struct timespec now;
    timespec_get(&now, TIME_UTC);
    return ((int64_t) now.tv_sec) * 1000 + ((int64_t) now.tv_nsec) / 1000000;
}
 
int cool(void) {
    int k;
 
    size_t i = sizeof(x) / sizeof(x[0]); /* Getting the size of the array as an integer. */
    k = 0;
    srand((unsigned)milliseconds());
    k = rand() % i;
    return k;
}
 
int main() {
 
  char myname[128];
  char *player;
  cuserid(myname);
 
  printf("%s was slaughtered by a %s.\n",myname , x[cool()]);
 
  return 0;
}

This is better than just seconds if a program is executed more often, this can get closer to true randomness. Even though computers are not the best at generating random numbers, you can try your best and get as close as possible.

Print the millisecond’s value this way.

printf("%u\n\n", milliseconds());

1 thought on “A nice example of C programming. Getting a random number in milliseconds.”

  1. Rid yourselves, then, of all spite, deceit, hypocrisy, envy and carping criticism

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    Reply

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