Are you an EPFL student looking for a semester project?
Work with us on data science and visualisation projects, and deploy your project as an app on top of GraphSearch.
Concept
Return type
Summary
In computer programming, the return type (or result type) defines and constrains the data type of the value returned from a subroutine or method. In many programming languages (especially statically-typed programming languages such as C, C++, Java) the return type must be explicitly specified when declaring a function.
In the Java example:
public void setShuma(int n1, int n2) {
Shuma = n1 + n2
}
public int getShuma() {
return Shuma;
}
the return type is . The program can therefore rely on the method returning a value of type . Various mechanisms are used for the case where a subroutine does not return any value, e.g., a return type of is used in some programming languages:
public void returnNothing()
A method returns to the code that invoked it when it completes all the statements in the method, reaches a return statement, or
throws an exception, whichever occurs first.
You declare a method's return type in its method declaration. Within the body of the method, you use the return statement to return the value.
Any method declared void doesn't return a value. It does not need to contain a return statement, but it may do so. In such a case, a return statement can be used to branch out of a control flow block and exit the method and is simply used like this:
return;
If you try to return a value from a method that is declared void, you will get a compiler error.
Any method that is not declared void must contain a return statement with a corresponding return value, like this:
return returnValue;
The data type of the return value must match the method's declared return type; you can't return an integer value from a method declared to return a boolean.
The getArea() method in the Rectangle Rectangle class that was discussed in the sections on objects returns an integer:
// A method for computing the area of the rectangle
public int getArea() {
return width * height;
}
This method returns the integer that the expression evaluates to.
The getArea method returns a primitive type. A method can also return a reference type.
Official source
About this result
This page is automatically generated and may contain information that is not correct, complete, up-to-date, or relevant to your search query. The same applies to every other page on this website. Please make sure to verify the information with EPFL's official sources.