What do you understand by default arguments and constant argument? Wri

1.	What do you understand by default arguments and constant argument? Write a short note on their usefulness.
Answer» Default arguments: C⁺⁺ allows us to assign default values to a function’s parameters which are useful in case a matching argument is not passed in the function call statement. The default values are specified at the time of function declaration. Example: float interest(float principal, int time, float rate=0.10); Constant argument: By constant argument, it is meant that the function cannot modify these arguments. In order to make an argument constant to a function, we can use the keyword const as shown : int sum (const int a, const int b); The qualifier const in function prototype tells the compiler that the function should not modify the argument. The constant arguments are useful when functions are called by reference.

What do you understand by default arguments and constant argument? Write a short note on their usefulness.

Answer»

Default arguments:

C⁺⁺ allows us to assign default values to a function’s parameters which are useful in case a matching argument is not passed in the function call statement. The default values are specified at the time of function declaration.

Example: float interest(float principal, int time, float rate=0.10);

Constant argument: By constant argument, it is meant that the function cannot modify these arguments. In order to make an argument constant to a function, we can use the keyword const as shown : int sum (const int a, const int b); The qualifier const in function prototype tells the compiler that the function should not modify the argument. The constant arguments are useful when functions are called by reference.

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