Add swap two numbers

math/swap_two_numbers.cpp

@@ -0,0 +1,69 @@
+/**
+ * Copyright 2025 @author princesharma2004
+ *
+ * @file
+ * \brief A C++ Program to swap two numbers using reference variables.
+ */
+#include <cassert>
+#include <iostream>
+
+/**
+ * Function to swap two numbers using reference variables.
+ * @param a First number.
+ * @param b Second number.
+ *
+ * \detail
+ * The algorithm uses a temporary variable to store the value of a,
+ * then assigns the value of b to a, and finally assigns the value
+ * stored in the temporary variable to b.
+ */
+void swap_two_numbers(int &a, int &b)
+{
+    int temp = a;
+    a = b;
+    b = temp;
+}
+
+/**
+ * Function for testing the swap_two_numbers() function with a
+ * first test case of 5 and 10 and assert statement.
+ */
+void test1()
+{
+    int a = 5, b = 10;
+    swap_two_numbers(a, b);
+    assert(a == 10 && b == 5);
+}
+
+/**
+ * Function for testing the swap_two_numbers() function with a
+ * second test case of -5 and 10 and assert statement.
+ */
+void test2()
+{
+    int a = -5, b = 10;
+    swap_two_numbers(a, b);
+    assert(a == 10 && b == -5);
+}
+
+/**
+ * Function for testing the swap_two_numbers() with
+ * all the test cases.
+ */
+void test()
+{
+    // First test.
+    test1();
+    // Second test.
+    test2();
+}
+
+/**
+ * Main Function
+ */
+int main()
+{
+    test();
+    std::cout << "Success." << std::endl;
+    return 0;
+}