104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
//-----------------------------LICENSE NOTICE------------------------------------
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// This file is part of CPCtelera: An Amstrad CPC Game Engine
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// Copyright (C) 2016 ronaldo / Fremos / Cheesetea / ByteRealms (@FranGallegoBR)
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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//------------------------------------------------------------------------------
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#include "cpctelera.h"
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#include <stdio.h>
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// Total random numbers to show (up to 255)
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#define N_RND_NUMBERS 50
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//////////////////////////////////////////////////////////////////
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// wait4UserKeypress
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// Waits till the user presses a key, counting the number of
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// loop iterations passed.
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//
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// Returns:
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// <u32> Number of iterations passed
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//
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u32 wait4UserKeypress() {
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u32 c = 0; // Count the number of cycles passed till user k
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// Wait 'till the user presses a key, counting loop iterations
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do {
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c++; // One more cycle
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cpct_scanKeyboard_f(); // Scan the scan the keyboard
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} while ( ! cpct_isAnyKeyPressed_f() );
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return c;
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}
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//////////////////////////////////////////////////////////////////
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// initialize
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// Shows introductory messages and initializes the pseudo-random
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// number generator
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//
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void initialize() {
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u32 seed; // Value to initialize the random seed
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// Introductory message
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printf("\017\003========= BASIC RANDOM NUMBERS =========\n\n\r");
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printf("\017\002Press any key to generate random numbers\n\n\r");
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// Wait till the users presses a key and use the number of
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// passed cycles as random seed for the Random Number Generator
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seed = wait4UserKeypress();
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// Random seed may never be 0, so check first and add 1 if it was 0
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if (!seed)
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seed++;
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// Print the seed and seed the random number generator
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printf("\017\003Selected seed: \017\002%d\n\r", seed);
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cpct_srand8(seed);
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}
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//////////////////////////////////////////////////////////////////
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// printRandomNumbers
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// Prints some random numbers in the screen, as requested.
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// INPUT:
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// nNumbers - Total amount of pseudo-random numbers to print
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//
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void printRandomNumbers(u8 nNumbers) {
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// Anounce numbers
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printf("\017\003Generating \017\002%d\017\003 random numbers\n\n\r\017\001", N_RND_NUMBERS);
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// Count from nNumbers to 0, printing random numbers
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while (nNumbers--) {
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u8 random_number = cpct_rand(); // Get next random number
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printf("%d ", random_number); // Print it
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}
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// End printing with newlines
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printf("\n\n\r");
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}
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//////////////////////////////////////////////////////////////////
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// MAIN ENTRY POINT OF THE APPLICATION
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//
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void main(void) {
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// Loop forever
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while (1) {
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// Initialize everything and print some random numbers
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initialize();
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printRandomNumbers(N_RND_NUMBERS);
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// Wait 'till the user stops pressing a key
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do { cpct_scanKeyboard_f(); } while ( cpct_isAnyKeyPressed_f() );
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}
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}
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