first commit

README.md

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+# tic_tac_toe
+
+Simple tic_tac_toe game for linux terminal

src/game.c

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+#include <stdio.h>
+#include <ctype.h>
+
+struct player {
+  const unsigned char X;
+  const unsigned char O;
+};
+
+char field[5][5]  = { '1', '|', '2', '|', '3',
+                      '-', '+', '-', '+', '-',
+                      '4', '|', '5', '|', '6',
+                      '-', '+', '-', '+', '-',
+                      '7', '|', '8', '|', '9' };
+
+// сlear screen
+void clrscr(void)
+{
+  printf("\033[2J");   /* Clear the entire screen. */
+  printf("\033[0;0f"); /* Move cursor to the top left hand corner */
+}
+
+// clear stdin
+void flush_input(void) {
+    char c;
+    while ( scanf("%c", &c) == 1 && c != '\n' );
+}
+
+// checking players turn input
+char turn_inp(char M[5][5], unsigned char player) {
+  char ch;
+  char N[9];
+  int err, c = 0;
+  int i, j, g = 0;
+
+  for (i = 0; i < 5; i++) {
+     for (j = 0; j < 5; j++) {
+       if (i%2 == 0 && j%2 == 0 ) {
+        N[g] = M[i][j];
+        g++;
+       }
+    }
+  }
+
+  printf("%c, your turn: ", player);
+  for (;;) {
+    err = 0;
+    ch = getchar();
+    flush_input();
+    c = ch - 48;
+    if (isdigit(ch)) {
+      for (g = 1; g < 10; g++) {
+        if (c == g && ch != N[g-1] ) {
+          printf("Input error! %c, repeat your turn: ", player);
+          err = 1;
+        }
+      }
+      if (err == 0) {return ch;}
+    } else {
+      printf("Input error! %c, repeat your turn: ", player);
+    }
+  }
+}
+
+// checking victory conditions
+int victory(char M[5][5], int free_turns) {
+  int i, j, g = 0;
+  char N[9];
+  for (i = 0; i < 5; i++) {
+     for (j = 0; j < 5; j++) {
+       if (i%2 == 0 && j%2 == 0 ) {
+        N[g] = M[i][j];
+        g++;
+       }
+     }
+  }
+  if ((N[0] == N[1] && N[1] == N[2]) ||
+      (N[3] == N[4] && N[4] == N[5]) ||
+      (N[6] == N[7] && N[7] == N[8]) ||
+      (N[0] == N[3] && N[3] == N[6]) ||
+      (N[1] == N[4] && N[4] == N[7]) ||
+      (N[2] == N[5] && N[5] == N[8]) ||
+      (N[0] == N[4] && N[4] == N[8]) ||
+      (N[2] == N[4] && N[4] == N[6])) {
+        return 1;
+      }
+
+  if (free_turns == 0)
+    return 2;
+
+  return 0;
+}
+
+// change gamefield
+void field_change(char M[5][5], unsigned char turn, unsigned char player) {
+  int i, j = 0;
+  for (i = 0; i < 5; i++) {
+     for (j = 0; j < 5; j++) {
+        if (M[i][j] == turn ) {
+          M[i][j] = player;
+      }
+     }
+  }
+}
+
+// print gamefield
+void print_field(char M[5][5]) {
+  int i,j = 0;
+  for (i = 0; i < 5; i++) {
+     for (j = 0; j < 5; j++) {
+       if (j < 4) {
+         if (M[i][j] == 'X') {
+           printf("\x1b[31m%c\x1b[0m ", M[i][j]);
+         } else if (M[i][j] == 'O') {
+           printf("\x1b[32m%c\x1b[0m ", M[i][j]);
+         } else {
+           printf("%c ", M[i][j]);
+         }
+       } else {
+         if (M[i][j] == 'X') {
+           printf("\x1b[31m%c\x1b[0m \n", M[i][j]);
+         } else if (M[i][j] == 'O') {
+           printf("\x1b[32m%c\x1b[0m \n", M[i][j]);
+         } else {
+           printf("%c \n", M[i][j]);
+         }
+       }
+     }
+  }
+}
+
+
+int main(void) {
+
+  char turn;
+  struct player p = { 'X', 'O' };
+  int z = 1;
+  int free_turns = 9;
+  int win = victory(field, free_turns);
+
+  do {
+    print_field(field);
+    printf("\n");
+
+    if (z == 1) {
+      turn = turn_inp(field, p.X);
+      field_change(field, turn, p.X);
+      free_turns--;
+      z = 0;
+    } else {
+      turn = turn_inp(field, p.O);
+      field_change(field, turn, p.O);
+      free_turns--;
+      z = 1;
+    }
+
+    win = victory(field, free_turns);
+    clrscr();
+
+  } while (win == 0);
+
+  if (win == 1) {
+    print_field(field);
+    printf("\n\n");
+    if (z == 0)
+      printf("Player \x1b[5;31m%c\x1b[0m wins!\n", p.X);
+    else
+      printf("Player \x1b[5;32m%c\x1b[0m wins!\n", p.O);
+  }
+
+  if (win == 2) {
+    print_field(field);
+    printf("\n");
+    const char go[] ="GAME OVER. Tie!";
+    printf("\x1b[5;32m%s\x1b[0m\n", go);
+  }
+
+  return 0;
+
+}