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content/cpp/functions.md

@@ -34,3 +34,13 @@ int square(int x) {
 ```
 
 Function abstraction is the ability to make a function easy to use without understanding exactly how the function works line by line. This makes it easy for other people to use your code faster. It is a good practice to make your code easy to use for other people.
+
+## Default arguments
+
+Suppose you want a function to occassionaly not have values for parameters explicitly define, you can set a default value for your parameters within your function.
+
+```c++
+void average(float num1 = 3, float num2 = 3, float num3 = 3);
+```
+
+In this example, the default parameters were create in the function prototype. Suppose you call the function by `average();`, then without passing and values, num1, num2, and num3 were all initialized with 3 as we have define in the prototype. Default arguments also work with just one parameter. You can set whatever parameter you want to have a default argument. Also, as long as the default argument is defined in the prototype, you should not include it in the definition.