Initial version w/o timing or counters.

cube-test

.*.swp

#

# Makefile

# Kevin Lyda, 2017-10-12 19:14

#

cube-test: cube-test.c

	cc -Wall -o cube-test cube-test.c

# vim:ft=make

#

/*

 * cube-test.c

 * Copyright (C) 2017 Kevin Lyda <kevin@phrye.com>

 *

 * Distributed under terms of the GPL license.

 */

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

int

random_two_digit_number() {

  return (rand() % 90) + 10;

}

int

cube(int n) {

  return n * n * n;

}

int

read_number() {

  char buf[10];

  if (!fgets(buf, sizeof buf, stdin)) {

    return 0;

  }

  return atoi(buf);

}

int

main(int argc, char *argv[]) {

  int guess, number;

  srand(time(NULL));

  while (1) {

    number = random_two_digit_number();

    printf("Number is %d. Cube root (0 to exit)? ", cube(number));

    guess = read_number();

    if (guess == 0) {

      exit(0);

    }

    if (guess == number) {

      printf("Correct.\n");

    } else {

      printf("Not correct. Number was %d.\n", number);

    }

  }

}