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If a function has the return type void, the return statement can be used without a value, in which case the program just breaks out of the current function and returns to the calling one. [ 1 ] [ 2 ] Similar syntax is used in other languages including Modula-2 [ 3 ] and Python .
In Python, functions are first-class objects that can be created and passed around dynamically. Python's limited support for anonymous functions is the lambda construct. An example is the anonymous function which squares its input, called with the argument of 5:
In some of these languages an extra keyword is used to declare no return value; for example void in C, C++ and C#. In some languages, such as Python, the difference is whether the body contains a return statement with a value, and a particular callable may return with or without a value based on control flow.
The return statement, used to return a value from a function; The import and from statements, used to import modules whose functions or variables can be used in the current program; The match and case statements, an analog of the switch statement construct, that compares an expression against one or more cases as a control-of-flow measure.
In a statement such as while ((ch = getchar ())!= EOF) {…}, the return value of a function is used to control a loop while assigning that same value to a variable. In other programming languages, Scheme for example, the return value of an assignment is undefined and such idioms are invalid.
The only exception is that errors are reported as coming from a call to eval(), and return statements become the result of the function. Unlike some languages, the argument to eval must be a string of one or more complete statements, not just expressions; however, one can get the "expression" form of eval by putting the expression in a return ...
In computer programming, the return type (or result type) defines and constrains the data type of the value returned from a subroutine or method. [1] 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:
The void type, in several programming languages derived from C and Algol68, is the return type of a function that returns normally, but does not provide a result value to its caller. Usually such functions are called for their side effects , such as performing some task or writing to their output parameters.