swapping numbers without third variable

Author: razzat008

solutions/ch_15_Swap_Numbers/answer2.js

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+// Declare a function swap that takes num_1 and num_2 as parameters.
+function swap(num_1, num_2) {
+  // At first print the numbers before swaping
+  console.log("Before swapping:\n num_1 = " + num_1 + "\n num_2 = " + num_2);
+  num_1 = num_1 + num_2;
+  num_2 = num_1 - num_2;
+  num_1 = num_1 - num_2;
+  // Check the result by printing the output
+  console.log("After swapping:\n num_1 = " + num_1 + "\n num_2 = " + num_2);
+}