Day 2

2019/2ndDay/challenge1.cpp

@@ -0,0 +1,79 @@
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <string>
+#include <vector>
+
+std::vector<int> tokenise( std::string input )
+{
+    std::stringstream ssInput( input );
+    std::vector<int> stream;
+
+    std::string s;
+	while( std::getline( ssInput, s, ',' ) ) {
+		stream.push_back( std::stoi( s ) );
+	}
+
+    return stream;
+}
+
+enum Opcodes
+{
+    Add = 1,
+    Multiply = 2,
+    End = 99
+};
+
+int main(int argc, char** argv)
+{
+
+    std::ifstream infile( argv[1] );
+
+    std::string input;
+    std::getline( infile, input );
+
+    std::vector<int> program = tokenise( input );
+
+    program[1] = 12; 
+    program[2] = 2; 
+
+    for ( int i = 0; i < program.size(); i += 4 ) 
+    {
+
+        int opcode = program[i];
+
+        std::cout << "Opcode : " << opcode << std::endl;
+
+        int operandLocA = program[i + 1]; 
+        int operandLocB = program[i + 2];
+
+        std::cout << "Operand locations : " << operandLocA << ", " << operandLocB << std::endl;
+
+        int operandA = program[operandLocA];
+        int operandB = program[operandLocB];
+
+        int resLoc = program[i + 3];
+        
+        std::cout << "Result location : " << resLoc << std::endl;
+
+        if ( opcode == Add )
+            program[resLoc] = operandA + operandB;
+        else if ( opcode == Multiply )
+            program[resLoc] = operandA * operandB;
+        else if ( opcode == End )
+        {
+            std::cout << "Program end" << std::endl << std::endl;
+            break;
+        }
+
+        std::cout << std::endl;
+
+    }
+
+
+    std::cout << "Program end state : ";
+    for ( auto& i : program )
+        std::cout << i << " ";
+    std::cout << std::endl;
+
+}