Question

give the diff forms of looping statements and their structure/ syntax

Answer 1

The two most efficient loops are the while (or do-while), and for loops.
while: while (statement) {
do action;
}
do-while: do {
do action;
} while (statement);
for: for (int i = 0; i < someNumber; i++) {
do actions;
}

Answer 2

here's another one; the goto loop:

label:
do_something();
if (something) goto label;

or you can forget the if condition and go for an infinite loop:

label:
do_something();
goto label;

Answer 3

'goto' is not a looping construct in the strictest sense, but it's a primitive control construct.

Answer 4

which may be used to construct loops, along with labels.

Answer 5

People will want to hurt you if you use gotos in the manner I outlined above; goto is considered harmful since it creates spaghetti code and messed up control flow and unstructured programs.

I would probably use goto to accomplish deep-nested early exits from formal loops, and that's it. You should do your best to re-structure your code so that you won't have to use a goto.

Answer 6

Also, you've got the \[\small\text{for each}\]construct in modern languages, which traverses items in collections.

In python:

for item in biglist:

iterates through the list biglist, with 'item' sequentially referencing elements in biglist.

Answer 7

Python-
while True:
##Do stuff

that example will occur forever until you say 'break'

x=5
while x > 0:
x = x - 1

That will end once 'x' variable reaches 0