5 files changed, 92 insertions(+), 4 deletions(-)

M README.md
M day02/.gitignore
M day02/Makefile
R day02/{day02.c => day02a.c}
A day02/day02b.c

@@ 12,6 12,7 @@ Languages used
 --------------
 
 - [Lua](https://www.lua.org/) (version 5.4)
+- [C11](https://en.wikipedia.org/wiki/C11)
 
 
 Licensing

@@ 1,1 1,1 @@
-day02
+day02[ab]

@@ 1,6 1,9 @@
-CFLAGS += -std=c11 -Os
+CFLAGS += -std=c11 -Os -Wall
 
-day02: day02.o
+all: day02a day02b
+
+day02a: day02a.o
+day02b: day02b.o
 
 clean:
-	$(RM) day02 day02.o
+	$(RM) day02a day02a.o day02b day02b.o

@@ 0,0 1,84 @@
+/*
+ * day02.c
+ * Copyright (C) 2022 Adrian Perez de Castro <aperez@igalia.com>
+ *
+ * Distributed under terms of the MIT license.
+ */
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stdio.h>
+
+enum Fig {
+    Rock = 1,
+    Paper = 2,
+    Scissors = 3,
+};
+
+enum Outcome {
+    Lose = 'X',
+    Draw = 'Y',
+    Win = 'Z',
+};
+
+static enum Fig
+winner(enum Fig f)
+{
+    switch (f) {
+        case Rock:
+            return Paper;
+        case Paper:
+            return Scissors;
+        case Scissors:
+            return Rock;
+    }
+
+    assert(!"unreachable");
+}
+
+static enum Fig
+loser(enum Fig f)
+{
+    switch (f) {
+        case Rock:
+            return Scissors;
+        case Paper:
+            return Rock;
+        case Scissors:
+            return Paper;
+    }
+
+    assert(!"unreachable");
+}
+
+int
+main(int argc, char *argv[])
+{
+    char other;
+    char outcome;
+
+    unsigned score = 0;
+
+    while (!feof(stdin) && scanf("%c %c\n", &other, &outcome) == 2) {
+        assert(other >= 'A' && other <= 'C');
+        assert(outcome >= 'X' && outcome <= 'Z');
+
+        const enum Fig fother = other - 'A' + 1;
+
+        switch ((enum Outcome) outcome) {
+            case Lose:
+                score += loser(fother) + 0;
+                break;
+            case Draw:
+                score += fother + 3;
+                break;
+            case Win:
+                score += winner(fother) + 6;
+                break;
+        }
+
+    }
+    printf("%u\n", score);
+
+    return 0;
+}