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Answer :

Functions are also known as methods.

Merits:

• Function helps in reducing the code.
• Modifying programs become easy when we use functions.
• It divides program into number of segments hence making the program easy to understand.
• It reduces the chances of errors. .
• Modifications of a program becomes easier.
• If there is any bug in function and the function is called at several places, then on editing the code at one place, all the bugs can be fixed.

Demerits :

• Complexity of the program increases.
• Execution speed decreases.

Know more :-

• Function, also known as methods is a set of instructions which runs when it is called.
• It is a piece of code that can perform a particular operation.
• It may or may not return a value. There are two types of functions - Return type and void.