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1
Methods
of Calling
Function
In C++, the arguments can be passed to a function in two ways. Based on the method of passing the arguments, the function calling methods can be classified as :
Methods of calling function
- Call by Value method
- Call by Reference or Address method.
Classification
This method copies the value of an actual parameter into the formal parameter of the function.
In this case, changes made to formal parameter within the function will have no effect on the actual parameter.
Call by value Method
Example
Example
Output
Quiz
1. Why variables remain unchanged even after the swap?
Quiz 1
The reason is same – function is called by value for num1 & num2. So actually var1 and var2 gets swapped (not num1 & num2). As in call by value actual parameters are just copied into the formal parameters.
answer
Quiz
2. In call by value, original value can not be changed or modified.
True or False
Quiz 2
True