Functions are a good alternative to having repeating blocks of code in a program. ... Functions also increase the reusability of code. Values can be passed to a function using variables – we call these parameters or arguments.

Why do we need function?

Why we need functions in C

a) To improve the readability of code. b) Improves the reusability of the code, same function can be used in any program rather than writing the same code from scratch. c) Debugging of the code would be easier if you use functions, as errors are easy to be traced.

Why do you need functions in programming languages?

Now you know why programming languages use functions, and why they're so important. The biggest reasons for including functions all come down to one truth: functions allow you to break a program into more manageable pieces. When you do this, your program becomes simpler to manage, easier to test, and apt for reuse.