update functions.md

content/cpp/functions.md

@@ -43,4 +43,4 @@ Suppose you want a function to occassionaly not have values for parameters expli
 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.
+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. __Keep in mind, default arguments must be at the end of the parameter list.__