Chapter4

montyHall.c

@@ -0,0 +1,49 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+int main(void) {
+    srand(time(NULL));  // Seed random number generator
+    int r, s, openD;
+    int counter = 0, win = 0;
+
+    while (1) {
+        r = rand() % 3; // Winning door (0, 1, or 2)
+        s = -1;
+
+        puts("Select one of the 3 doors (0, 1, 2). Enter -1 to quit:");
+        scanf("%d", &s);
+        if (s == -1) break;
+
+        // Open a door with a goat (not the winning door or the selected door)
+        openD = rand() % 3;
+        while (openD == r || openD == s) {
+            openD = rand() % 3;
+        }
+
+        printf("You chose: %d, a goat is behind door: %d\n", s, openD);
+        puts("Do you want to choose another door? (Enter new door number):");
+        scanf("%d", &s);
+
+        while (s == openD) {
+            puts("This door is already opened! Select another door:");
+            scanf("%d", &s);
+        }
+
+        if (s == r) {
+            puts("YOU WON!");
+            win++;
+        } else {
+            puts("YOU LOSE!");
+        }
+        counter++;
+    }
+
+    if (counter > 0) {
+        printf("Win percentage: %d%%\n", (win * 100) / counter);
+    } else {
+        puts("No games played.");
+    }
+
+    return 0;
+}