Can a variable in a for loop be used after the loop exits?

Can a variable in a for loop be used after the loop exits?

Not at all. As long as you don’t save the object’s address past the end of its lifetime, there’s nothing wrong with it. The allocation and deallocation will very often be done on entry to and exit from the function rather than the block, as a performance optimization.

Which statement is not true about do-while loop?

Which statement is NOT true about do-while loops. The number of times a do-while loop is executed is dependent upon the value of the counter variable.

Are local variables made inside a loop destroyed?

1 Answer. At the end of each loop iteration, the variable goes out of scope and ceases to exist. That doesn’t mean assigning a special value (such as null ) to it; it just means that the memory is available to be used by other things.

Can a while loop return a value?

Answer 527c848480ff33f509001fb7 The reason is because the while loop has an exit point controlled by a boolean variable. It doesn’t need a return statement, which is only to be used in a body of a function.

Can we initialize variable in for loop?

Often the variable that controls a for loop is needed only for the purposes of the loop and is not used elsewhere. When this is the case, it is possible to declare the variable inside the initialization portion of the for.

What happens when you return in a while loop?

It is good practice to always have a return statement after the for/while loop in case the return statement inside the for/while loop is never executed. Otherwise, a compile-time error will occur because the method cannot return nothing (unless it has the Java reserved word “void” in the method header).

How do you return a value from a forEach loop?

Return Value of forEach in JavaScript

1. forEach executes the callback function once for each array element.
2. It always returns undefined.
3. It does not mutate the array, but the callback can if programmed to do so.
4. forEach is not chain-able like map, reduce or filter.

Is used when the loop must run at least one time?

Since testing is done at the bottom of the loop, the loop body must execute at least once, regardless of conditions. It executes the loop body, then tests the condition to see if it should execute it again. …

Can a variable be declared outside of a while loop?

The scope of local variables should always be the smallest possible. In your example I presume str is not used outside of the while loop, otherwise you would not be asking the question, because declaring it inside the while loop would not be an option, since it would not compile.

What happens when variable loses value at end of while Read loop?

Iain and Ignacio’s answers have others.) SubShell ends, variables and values are destroyed (they don’t get back to the calling process/script). You echo your original CNT value of 0. Try passing the data in a sub-shell instead, like it’s a file before the while loop.

Why are variables defined inside the body of a loop?

It makes the code easier to understand by restricting unnecessary interactions between different parts of the code. If X is defined inside the body of the loop, nothing outside the loop can affect it (if you haven’t done something too tricky), which makes it easier to reason about the code.

Why is STR not declared outside of the while loop?

In your example I presume str is not used outside of the while loop, otherwise you would not be asking the question, because declaring it inside the while loop would not be an option, since it would not compile. So, since str is not used outside the loop, the smallest possible scope for str is within the while loop.