commit 885f33ebaa1f6d1e1e333ecd0169a832612af220
parent ae326674263be3019706d7594522110b620259ce
Author: Amit Dutta <amitdutta4255@gmail.com>
Date: Wed, 8 Oct 2025 09:20:35 +0530
new 30
Diffstat:
| A | letusc/luc030.c | | | 75 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
1 file changed, 75 insertions(+), 0 deletions(-)
diff --git a/letusc/luc030.c b/letusc/luc030.c
@@ -0,0 +1,74 @@
+/* Write a program for a matchstick game being played between the
+computer and a user. Your program should ensure that the computer
+always wins. Rules for the game are as follows :
+ - There are 21 matchsticks.
+ - The computer asks the player to pick 1, 2, 3, or 4 matchsticks.
+ - After the person picks, the computer does its picking.
+ - Whoever is forced to pick up the last matchstick loses the game.
+*/
+/* Author - Amit Dutta, Date - 8th OCT, 2025 */
+/* Let Us C, Chap- 5, Page - 87, Qn No.: B(c) */
+
+/* Strategy: The total number of matchsticks is 21. To guarantee a win,
+the computer ensures that after its turn, the number of remaining
+matchsticks is always a multiple of 5 plus 1 (i.e., 16, 11, 6, 1).
+This is achieved by making the sum of the player's pick and the
+computer's pick equal to 5 in each round. This forces the player
+to pick the final matchstick. */
+
+#include <stdio.h>
+int main()
+{
+ int remaining_matchsticks = 21, player_pick, computer_pick;
+ printf(" --- Matchstick Game ---\n");
+ printf("Rules: There are 21 matchsticks. You can pick 1, 2, 3, or 4.\n");
+ printf("Whoever is forced to pick the last matchstick loses the game.\n");
+ while (remaining_matchsticks > 1)
+ {
+ // game start
+ printf("\n--------------------------");
+ printf("\nRemaining Matchsticks : %d", remaining_matchsticks);
+
+ // player pick and checking input is valid or not
+ printf("\nYour turn: Pick 1, 2, 3, or 4 matchsticks: ");
+ if (scanf("%d", &player_pick) != 1)
+ {
+ printf("\n\tPlease enter a number.");
+ while (getchar() != '\n')
+ ;
+ continue;
+ }
+
+ // checking player pick is valid or not
+ if (player_pick < 1 || player_pick > 4)
+ {
+ printf("\n\tPlease enter a number among 1, 2, 3 and 4.");
+ while (getchar() != '\n')
+ ;
+ continue;
+ }
+
+ if (player_pick > remaining_matchsticks)
+ {
+ printf("\nInvalid choice! There are not enough matchsticks left.");
+ while (getchar() != '\n')
+ ;
+ continue;
+ }
+
+ // computer_picks
+ computer_pick = 5 - player_pick;
+ printf("\ncomputer_picks : %d", computer_pick);
+
+ // remaining matchsticks
+ remaining_matchsticks = remaining_matchsticks - (player_pick + computer_pick);
+ }
+
+ // match over
+ printf("\n----------------------------------\n");
+ printf("Only 1 matchstick is left.\n");
+ printf("You are forced to pick the last matchstick. You lose!\n");
+ printf("The computer wins.\n");
+
+ return 0;
+}+
\ No newline at end of file
