Why do we use a while loop instead of a loop?
To improve the maintainability of your code since all three major parts of a loop i.e. initialization, increment / decrement and test condition are written at the same line (in most cases). It limits the scope of counter variables better than a while loop, hence it helps in better memory management.
Why use'while'loop instead of'for'loop?
why use 'while' loop instead of 'for'? why use 'while' loop instead of 'for'? is there a big difference? in general a while loop is used if you want an action to repeat itself until a certain condition is met i.e. if statement. An for loop is used when you want to iterate through an object. i.e. iterate through an array.
What is a loop in programming?
Almost every programming language has a concept called loop, which helps in running a single block of code a number of times. In programming, we often have to execute the statements more than once, in which case a loop can be used.
Which is more efficient for loop or while loop?
Generally, the for loop can be more efficient than the while loop, but not always. The idea of the While loop is: While something is the case, do the following block of code. In this code, we have defined a variable name condition, and condition starts at a value of 1.
Why for loop is the best?
In a for loop, the index of iteration is always a clearly defined variable. By common practice, the variable is usually the letter i. This makes it easy to index one or more arrays by the index. For loops can easily be used to iterate through elements of multidimensional arrays using nested for loops.
Why for loop is better than while loop in Python?
For loop allows a programmer to execute a sequence of statements several times, it abbreviates the code which helps to manage loop variables. While loop allows a programmer to repeat a single statement or a group of statements for the TRUE condition. It verifies the condition before executing the loop.
What is the main difference between for loop and while loop?
Here are few differences:For loopWhile loopOnce the statement(s) is executed then after increment is done.Increment can be done before or after the execution of the statement(s).It is normally used when the number of iterations is known.It is normally used when the number of iterations is unknown.6 more rows•3 days ago
Which is the best loop?
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What are the pros and cons of for loop?
Pros: It's straightforward. You loop through every single element for a given string or array . Cons: It's very restricting, you can't determine where to start or how long you want to go on for. Incrementing is always set to one at a time.
Is for loop faster than while Python?
For vs While Loop in PythonBasis of ComparisonFor LoopWhile LoopSpeed (May Vary on Conditions)On basis of disassembly, for loop is faster than while loop.On basis of disassembly, the while loop is slower than for loop.6 more rows•Jul 11, 2021
Which is faster while or for in Python?
Using Pure Python In this case, the for loop is faster, but also more elegant compared to while. Please, have in mind that you can't apply list comprehensions in all cases when you need loops. Some more complex situations require the ordinary for or even while loops.
When would you use a for loop?
For-loops are typically used when the number of iterations is known before entering the loop. For-loops can be thought of as shorthands for while-loops which increment and test a loop variable.
What is the difference between a for loop and a while loop?
The for loop is quite similar to the while loop in terms of memory consumption and speed. However, the for loop is preferable when you know exactly the number of times the loop has to be repeated. On the contrary, while loop is appropriate when the exact number of iterations is not known, meaning you do not know how many times the loop has to be repeated.
Why do we use loops in programming?
Loops come in extremely handy in situations such as iterating through data structures or traversing through large data sets in order to filter out junk data. When using a loop within a program, you can write one set of instructions that operates on multiple data sets.
Why do we use for loops in C?
For loops are used only to make the code slightly shorter, but also make it easier for other C programmers to read. It seems appropriate when the initialization and increment are logically related and are single statements.
What is a for loop?
What is For Loop? A for loop is an entry control statement used for the repeated execution of certain statements along with the repeated testing for a definite value of expression to be either true or false. The for loop is used for definite loops when the number of iterations are known.
When is a for loop preferable?
However, the for loop is preferable when you know exactly the number of times the loop has to be repeated. On the contrary, while loop is appropriate when the exact number of iterations is not known, meaning you do not know how many times the loop has to be repeated.
Can a statement be a block?
Here, statement can be a single or a block of statements. The loop will continue to execute until the condition is true and will terminate once the condition is false.
Can you have a while loop in C?
On the contrary, there is no built-in loop control variable with a while loop . Instead, you can specify any condition that evaluates to either a True or a False value.
For loop
The initialization, condition checking, and the iteration statements are written at the beginning of the loop.
While condition
The initialization and the condition checking is done at the beginning of the loop.
When to use a while loop?
in general a while loop is used if you want an action to repeat itself until a certain condition is met i.e. if statement. An for loop is used when you want to iterate through an object. i.e. iterate through an array. A for loop runs for a pre-determined number of times.
How many iterations does a while loop take?
A while loop will carry on until a pre-determined scenario takes place. That may happen immediately, or it may require a hundred iterations. So, the number of loops is governed by an outcome, not a number.
Can you manipulate a for loop?
A for loop has it's bounds set from the beginning and, yes, while you can manipulate those bounds, the general implementation is such that the maximum number of loops is pre-determined. I hope that makes sense! Steve. thanks a lot guys!
Which is more structured, a for loop or a while loop?
A for loop is more structured than the while loop. The keyword for is used, followed by three statements: The increment does not have be ++, but you’ll see that most commonly. So, in summary, the while loop has a looser syntax and the for loop has a more rigid syntax.
When to use a while loop?
Use a for loop when you know the loop should execute n times. Use a while loop for reading a file into a variable. Use a while loop when asking for user input. Use a while loop when the increment value is nonstandard. Thanks for reading.
What is the while and for loop?
As a newcomer to coding, the while and for loops are the first two iteration structures you will learn. They’re critical to understand, as they open up a world of possibilities when paired with decision structures like if / else statements. If you’re learning on your own or your instructor was not particularly opinionated, ...
Does increment have to be ++?
The increment does not have be ++, but you’ll see that most commonly. So, in summary, the while loop has a looser syntax and the for loop has a more rigid syntax. A while loop expects some sort of modification to the variable in the body, whereas everything is in the for loop’s definition.