What is the difference between void and non void methods?

Non-void methods differ from void methods in that they give something back. The return type declares what the method is going to “give back” or return. The keyword return is required in all non-void methods. Since the method sum has a return type of int the return line is required to return a value of this type.

What is the point of void methods?

As you said, the void type keyword means that the method will not return a value. Methods like this are intended to “just do something”. In the case of main() , the method will not return a value, because there is no calling method to return it to — that’s where your program begins.

What is void in Objective C?

The (void) indicates the return type. This method doesn’t return anything, so its result can’t be assigned to anything.

What is the difference between void and return method?

Void simply means nothing. It doesn’t take any parameters nor it returns anything. Return is use to give command back to the calling function and it returns value to Calling function.

What is the difference between void method and value returning method?

A void method is one that simply performs a task and then terminates. A value – returning method not only performs a task but also sends a value back to the code that called it.

What does void type not allowed here mean?

The error message is telling you exactly what is wrong — you’re trying to extract a result from a method that does not return a result. Instead, have the mileage() method return a String, not print out a String. the result type of M is Void, or the result type of N is assignable to that of M.

What is the difference between and in Objective-C?

Objective C was developed in early 1980s by Brad Cox and Tom Love. It is an object-oriented, general purpose language and was created with the vision of providing small talk-style messaging to the C programming language….Difference between C and Objective C.

What is block syntax in Objective-C?

Blocks are a language-level feature added to C, Objective-C and C++ which allow you to create distinct segments of code that can be passed around to methods or functions as if they were values. Blocks are Objective-C objects which means they can be added to collections like NSArray or NSDictionary.

Do void methods take parameters?

You can use any name you want for methods, except main or any of the Java keywords. And they are both void , which means that they don’t yield a result (unlike the Math methods, for example). The parentheses after the method name contain a list of variables, called parameters, where the method stores its arguments.

When would you use void method?

When to use Void or Value-Returning Functions: Void Function: when must return more than one value or modify any of the caller’s arguments.