Question

Consider the following function definition. 

int add (int a, int b=2, int c=5) 

{ 

int s = a + b + c; 

cout<<“Sum is :”<<s;

}

Predict the output of the above code for the following function calls: 

1. add (5, 8, 10); 

2. add (5, 8); 

3. add (5);

Answer 1

1. add(5, 8, 10). Here a = 5, b = 8 and c = 10. 

Then It prints 23(5 + 8 + 10) 

2. add(5, 8). Here a = 5, b = 8 and no value for c then c will take the default value 5. 

Hence it prints 18(5 + 8 + 5(default value for c)). 

3. add(5). Here a = 5 and no values for b and c, then b and c will take the default values 2 and 5 respectively. 

Hence it prints 12(5 + 2 + 5(default values for b and c)).