13 Facts About For loop

For-For loop has two parts: a header specifying the iteration, and a body which is executed once per iteration.

Name for-For loop comes from the word for, which is used as the keyword in many programming languages to introduce a for-For loop.

The For loop is then repeated if the condition evaluates to true.

In computer programming, a For loop counter is a control variable that controls the iterations of a For loop .

Loop counters change with each iteration of a For loop, providing a unique value for each individual iteration.

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In some languages the For loop variable is immutable within the scope of the For loop body, with any attempt to modify its value being regarded as a semantic error.

Situations where the address of the For loop variable is passed as an argument to a subroutine make it very difficult to check, because the routine's behavior is in general unknowable to the compiler.

For instance, within the For loop a reference to element of an array would likely employ the auxiliary variable, but if is a parameter to some routine, it would likely be a reference to the proper variable instead.

The syntax for a three-expression for-For loop is nearly identical in all languages that have it, after accounting for different styles of block termination and so on.

Notice that the end-For loop marker specifies the name of the index variable, which must correspond to the name of the index variable in the start of the for-For loop.

All the three sections in the for loop are optional, with an empty condition equivalent to true.

Contrary to other languages, in Smalltalk a for-For loop is not a language construct but defined in the class Number as a method with two parameters, the end value and a closure, using self as start value.

Python does not contain the classical for loop, rather a foreach loop is used to iterate over the output of the built-in range function which returns an iterable sequence of integers.