From d9c798726930e6541a895c48f5deebcca78b8fb4 Mon Sep 17 00:00:00 2001
From: studiosi <david@studiosi.es>
Date: Wed, 12 Aug 2026 08:56:24 +0300
Subject: [PATCH] Solved: 04 - Variables and Types

---
 .../src/variables_and_types.cpp               | 47 +++++++++----------
 1 file changed, 21 insertions(+), 26 deletions(-)

diff --git a/modules/01_fundamentals/src/variables_and_types.cpp b/modules/01_fundamentals/src/variables_and_types.cpp
index 3da84fa..60b7390 100644
--- a/modules/01_fundamentals/src/variables_and_types.cpp
+++ b/modules/01_fundamentals/src/variables_and_types.cpp
@@ -1,43 +1,38 @@
 #include "variables_and_types.hpp"
 
+#include <sstream>
+
 namespace fundamentals {
 
-auto add_integers(int lhs, int rhs) -> int {
-    // TODO: Return the sum.
-    (void)lhs;
-    (void)rhs;
-    return 0;
+auto add_integers(const int lhs, const int rhs) -> int {
+    return lhs + rhs;
 }
 
-auto multiply_doubles(double lhs, double rhs) -> double {
-    // TODO: Return the product.
-    (void)lhs;
-    (void)rhs;
-    return 0.0;
+auto multiply_doubles(const double lhs, const double rhs) -> double {
+    return lhs * rhs;
 }
 
-auto is_even(std::int64_t value) -> bool {
-    // TODO: Return true when value is divisible by 2.
-    (void)value;
-    return false;
+auto is_even(const std::int64_t value) -> bool {
+    return value % 2 == 0;
 }
 
-auto describe_type(int value) -> std::string {
-    // TODO: Return "int:" followed by the decimal representation.
-    (void)value;
-    return "int:0";
+auto describe_type(const int value) -> std::string {
+    auto oss = std::ostringstream{};
+    oss << "int:" << value;
+    return oss.str();
 }
 
-auto describe_type(double value) -> std::string {
-    // TODO: Return "double:" followed by the value with one decimal place.
-    (void)value;
-    return "double:0.0";
+auto describe_type(const double value) -> std::string {
+   auto oss = std::ostringstream{};
+   oss << "double:" << value;
+   return oss.str();
 }
 
-auto describe_type(bool value) -> std::string {
-    // TODO: Return "bool:true" or "bool:false".
-    (void)value;
-    return "bool:false";
+auto describe_type(const bool value) -> std::string {
+    auto oss = std::ostringstream{};
+    const std::string representation = value ? "true" : "false";
+    oss << "bool:" << representation;
+    return oss.str();
 }
 
 }  // namespace fundamentals