Data commit

Task/Two-bullet-roulette/C/two-bullet-roulette.c

@@ -0,0 +1,120 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+
+static int nextInt(int size) {
+    return rand() % size;
+}
+
+static bool cylinder[6];
+
+static void rshift() {
+    bool t = cylinder[5];
+    int i;
+    for (i = 4; i >= 0; i--) {
+        cylinder[i + 1] = cylinder[i];
+    }
+    cylinder[0] = t;
+}
+
+static void unload() {
+    int i;
+    for (i = 0; i < 6; i++) {
+        cylinder[i] = false;
+    }
+}
+
+static void load() {
+    while (cylinder[0]) {
+        rshift();
+    }
+    cylinder[0] = true;
+    rshift();
+}
+
+static void spin() {
+    int lim = nextInt(6) + 1;
+    int i;
+    for (i = 1; i < lim; i++) {
+        rshift();
+    }
+}
+
+static bool fire() {
+    bool shot = cylinder[0];
+    rshift();
+    return shot;
+}
+
+static int method(const char *s) {
+    unload();
+    for (; *s != '\0'; s++) {
+        switch (*s) {
+        case 'L':
+            load();
+            break;
+        case 'S':
+            spin();
+            break;
+        case 'F':
+            if (fire()) {
+                return 1;
+            }
+            break;
+        }
+    }
+    return 0;
+}
+
+static void append(char *out, const char *txt) {
+    if (*out != '\0') {
+        strcat(out, ", ");
+    }
+    strcat(out, txt);
+}
+
+static void mstring(const char *s, char *out) {
+    for (; *s != '\0'; s++) {
+        switch (*s) {
+        case 'L':
+            append(out, "load");
+            break;
+        case 'S':
+            append(out, "spin");
+            break;
+        case 'F':
+            append(out, "fire");
+            break;
+        }
+    }
+}
+
+static void test(char *src) {
+    char buffer[41] = "";
+    const int tests = 100000;
+    int sum = 0;
+    int t;
+    double pc;
+
+    for (t = 0; t < tests; t++) {
+        sum += method(src);
+    }
+
+    mstring(src, buffer);
+    pc = 100.0 * sum / tests;
+
+    printf("%-40s produces %6.3f%% deaths.\n", buffer, pc);
+}
+
+int main() {
+    srand(time(0));
+
+    test("LSLSFSF");
+    test("LSLSFF");
+    test("LLSFSF");
+    test("LLSFF");
+
+    return 0;
+}