day 2 task 1

2/main.cpp

@@ -0,0 +1,35 @@
+#include <cstdio>
+#include <fstream>
+#include <iostream>
+#include <string>
+
+constexpr char ROCK = 1;
+constexpr char PAPER = 2;
+constexpr char SCISSORS = 3;
+
+inline int get_result(const char& myChoice, const char& opponentChoice) {
+    if (myChoice == SCISSORS and opponentChoice == ROCK) { return 0; }
+    else if (myChoice == ROCK and opponentChoice == SCISSORS) { return 6; }
+    else if (myChoice == opponentChoice) { return 3; }
+    else if (myChoice > opponentChoice) { return 6; }
+    return 0;
+}
+
+int main() {
+    int score = 0;
+    auto is = std::ifstream("scores.txt");
+    std::string line;
+    if (is.is_open()) {
+        for (std::string line; std::getline(is, line); ) {
+            char other = line.at(0) + 1 - 'A'; // convert to 1,2,3;
+            char mine = line.at(2) + 1 - 'X'; // convert to 1,2,3
+            score += mine + get_result(mine, other);
+        }
+    }
+    else {
+        std::cerr << "Could not open file scores.txt" << std::endl;
+        return 1;
+    }
+    std::cout << "My score is " << score << std::endl;
+    return 0;
+}

2/scores.txt__

@@ -0,0 +1,3 @@
+A Y
+B X
+C Z