add solutions

1 files changed, 37 insertions, 0 deletions

diff --git a/challenge-254/witawayar/cpp/ch-1.cpp b/challenge-254/witawayar/cpp/ch-1.cpp
new file mode 100644
index 0000000000..f08e21c8c6
--- /dev/null
+++ b/challenge-254/witawayar/cpp/ch-1.cpp
@@ -0,0 +1,37 @@
+// g++ -Wall -Wextra -Wpedantic -std=c++17 cpp/ch-1.cpp
+#include <cmath>     // abs, round, cbrt
+#include <iostream>
+#include <sstream>   // form the error message
+#include <vector>
+
+static constexpr double TOLERANCE = 1E-6;
+
+bool fun(int n) {
+    double cube_root = std::cbrt(n);
+    return std::abs(cube_root - std::round(cube_root)) < TOLERANCE;
+}
+
+int main() {
+    // Tests
+    std::vector<std::pair<int, int>> tests = {
+        {0, true},
+        {1, true},
+        {-343, true},
+        {27, true},
+        {122, false},
+        {6, false},
+        {777, false}
+    };
+
+    for (const auto& [input, expected_output] : tests) {
+        int got = fun(input);
+        if (got != expected_output) {
+            std::stringstream error_msg;
+            error_msg << "Expected " << expected_output << ", got " << got;
+            throw std::runtime_error(error_msg.str());
+        }
+    }
+
+    std::cout << "done-testing, success\n";
+
+}