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In computer science, a for-loop or for loop is a control flow statement for specifying iteration. Specifically, a for-loop functions by running a section of code repeatedly until a certain condition has been satisfied. For-loops have two parts: a header and a body. The header defines the iteration and the body is the code executed once per ...
A loop invariant is an assertion which must be true before the first loop iteration and remain true after each iteration. This implies that when a loop terminates correctly, both the exit condition and the loop invariant are satisfied. Loop invariants are used to monitor specific properties of a loop during successive iterations.
In computer programming, foreach loop (or for-each loop) is a control flow statement for traversing items in a collection. foreach is usually used in place of a standard for loop statement . Unlike other for loop constructs, however, foreach loops [ 1 ] usually maintain no explicit counter: they essentially say "do this to everything in this ...
The LOOP statement restarts the current iteration of the enclosing loop structure, and if the enclosing loop is a FOR or FOR EACH loop, it increases the iterator, moving to the next iteration of the loop. The EXIT statement immediately terminates execution of the enclosing loop structure.
stop/halt/exit. Fortran: STOP number; C, C++: exit ... loop < sequence > exit when test; ... Various methods have been used to describe the form of statements in ...
In the Bourne shell, exit value of the last command executed in the function In C [1] and C++, [2] undefined behavior if function is value-returning In PHP, [12] returns NULL. In Javascript, [13] returns the value undefined. In Java and C#, not permitted if function is value-returning BASIC
The most common deviation from structured programming is early exit from a function or loop. At the level of functions, this is a return statement. At the level of loops, this is a break statement (terminate the loop) or continue statement (terminate the current iteration, proceed with next iteration). In structured programming, these can be ...
Moreover, C++11 allows foreach loops to be applied to any class that provides the begin and end functions. It's then possible to write generator-like classes by defining both the iterable methods (begin and end) and the iterator methods (operator!=, operator++ and operator*) in the same class. For example, it is possible to write the following ...