Task 02: git task

scissors/scissors_game/Makefile

@@ -0,0 +1,6 @@
+CC=gcc
+SOURCES=main.c scissors.c
+EXECUTABLE=scissors_game
+
+all: $(SOURCES)
+	$(CC) $(SOURCES) -o $(EXECUTABLE)

scissors/scissors_game/main.c

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdio.h>
+#include <string.h>
+#include "scissors.h"
+
+static const char * const Game_Elements[] = {
+	"rock", "paper", "scissors", "unknown"};
+
+int main(void)
+{
+	char input;
+	int res;
+	int comp_choise;
+
+	init_scissors();
+	do {
+		printf("Please choose: rock (r) - paper (p) - scissors (s)\n");
+		scanf("%1s", &input);
+		res = char_to_element_index(input);
+		if (res == UNKNOWN) {
+			printf("You've chosen something strange!\n");
+			continue;
+		}
+		comp_choise = play_scissors();
+		printf("You choose %s, I choose %s\n",
+			Game_Elements[res], Game_Elements[comp_choise]);
+		switch (get_game_result(res, comp_choise)) {
+		case LOST:
+			printf("I win: %s beats %s\n",
+				Game_Elements[comp_choise], Game_Elements[res]);
+			break;
+		case WINN:
+			printf("You win: %s beats %s\n",
+				Game_Elements[res], Game_Elements[comp_choise]);
+			break;
+		case DRAW:
+			printf("It's draw\n");
+			break;
+		}
+	} while (1);
+}
+

scissors/scissors_game/scissors.c

@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <stdlib.h>
+#include <time.h>
+#include "scissors.h"
+
+/*
+ *	Table indicates user's lost or win
+ *	The row index corresponds to user's choise
+ *	The column index corresponds to comp's choice
+ */
+
+static const int game_table[3][3] = {
+/*		rock	paper	scissors	*/
+/* rock*/	DRAW,	LOST,	WINN,
+/* paper*/	WINN,	DRAW,	LOST,
+/* sciss*/	LOST,	WINN,	DRAW
+};
+
+int char_to_element_index(char c)
+{
+	int ans = UNKNOWN;
+
+	switch (c) {
+	case 'r':
+		ans = ROCK;
+		break;
+	case 'p':
+		ans = PAPER;
+		break;
+	case 's':
+		ans = SCISSORS;
+		break;
+	}
+	return ans;
+}
+
+void init_scissors(void)
+{
+	srand(time(NULL));
+}
+
+int play_scissors(void)
+{
+	return (rand()%3);
+}
+
+int get_game_result(int user, int comp)
+{
+	return game_table[user][comp];
+}

scissors/scissors_game/scissors.h

@@ -0,0 +1,14 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#define	ROCK		0
+#define	PAPER		1
+#define	SCISSORS	2
+#define	UNKNOWN		3
+#define	DRAW		0
+#define	LOST		1
+#define	WINN		2
+
+int char_to_element_index(char c);
+void init_scissors(void);
+int play_scissors(void);
+int get_game_result(int user, int comp);