Difference Between for and while loop
- For loop. The initialization, condition checking, and the iteration statements are written at the beginning of the loop.
- Example
- While condition. The initialization and the condition checking is done at the beginning of the loop. It is used only when the number of iterations isn’t known.
- Example
What is the difference between a for and a while loop?
24/03/2021 · Difference Between for and while loop For loop. The initialization, condition checking, and the iteration statements are written at the beginning of the loop. Example. While condition. The initialization and the condition checking is done at the beginning of the loop. It is used only... Example.
What is the difference between'for'and'while'loop?
27/06/2019 · for loop provides a concise way of writing the loop structure. Unlike a while loop, a for statement consumes the initialization, condition and increment/decrement in one line thereby providing a shorter, easy to debug structure of looping.
What is the while loop condition in Python?
28/12/2021 · The difference between for loop and while loop is that in for loop the number of iterations to be done is already known and is used to obtain a certain result whereas in while loop the command runs until a certain condition is reached and the statement is proved to be false.
What is the difference between two loop statements in Python?
10/08/2020 · Definition of “for” & “while” loop. For Loop. 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. While loop allows a programmer to repeat a single statement or a group of statements for the TRUE condition.
Which is better for loop or while loop?
In general, you should use a for loop when you know how many times the loop should run. If you want the loop to break based on a condition other than the number of times it runs, you should use a while loop.20-Sept-2021
Why is a for loop better?
Pros: 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.18-Feb-2016
Why for loop is better than while?
for loop: for loop provides a concise way of writing the loop structure. Unlike a while loop, a for statement consumes the initialization, condition and increment/decrement in one line thereby providing a shorter, easy to debug structure of looping.27-Jun-2019
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.11-Jan-2018
How to tell between for loop and while loop?
Main Differences Between For loop and While loop 1 BIn for loop, the number of iterations to be conducted is already known whereas in while loop the number of iterations are not known. 2 For loop contains only a single condition whereas while loop may contain a set of commands to be executed together. 3 In for loop, initialization of command is done only once but in while loop initialization of command is needed each time the iteration of command is done. 4 If the condition is absent in for loop, the loop iterates for an infinite number of times whereas the while loop shows an error in case of the absence of the condition. 5 For loop can be used only in case of a known number of iterations whereas while loop is used only when the number of iterations is not known.
What is a loop in programming?
A loop is a command that tends to repeat itself to obtain the desired result. In other words, a programming command that repeats itself either the known number of times or the unknown number of times to fulfill certain conditions is defined as a loop. There are various kinds of loops such as for loop, while loop, if loop, if-else loop, ...
When to use while loop or for loop?
For loop can be used only in case of a known number of iterations whereas while loop is used only when the number of iterations is not known.
What are the most commonly used loops?
There are various kinds of loops such as for loop, while loop, if loop, if-else loop, if-else-if loop, etc. But the most commonly used loops are for and while loops.
What is a while loop?
A while loop is when the command iterates for an uncertain number of times till the condition is true. Once the condition is proved false, the iteration of command stops. Initialization in while loop is done each time the loop iterates.
What is the difference between a for loop and a while loop?
For loop contains only a single condition whereas while loop may contain a set of commands to be executed together. In for loop, initialization of command is done only once but in while loop initialization of command is needed each time the iteration of command is done.
What happens when a loop is incorrect?
If the structure of the loop is incorrect the programming will show the syntax error. Loops execute either to get a result or to satisfy a condition or set of conditions. It is a fundamental of the programming languages. The loop structure asks a question during execution and executes until the answer is satisfying.
What is the difference between a for loop and a while loop?
Main differences between “for” and “while” loop 1 Initialization, conditional checking, and increment or decrement is done while iteration in “for” loop executed. while on the other hand, only initialization and condition checking in the syntax can be done. 2 For loop is used when we are aware of the number iterations at the time of execution. on the other hand, in “while” loop, we can execute it even if we are not aware of the number of iterations. 3 If you forgot to put the conditional statement in for loop, it will reiterate the loop infinite times but if you forgot to put the conditional statement in while loop, it will show an error to you. 4 The syntax in the for loop will be executed only when the initialization statement is on the top of the syntax but in case of while loop, it doesn’t matter whether initialization statement finds anywhere in the syntax. 5 The iteration will be executed on if the body of the loop executes. on the contrary, the iteration statement in while loop can be written anywhere in the syntax.
What is the meaning of "for loop" in Python?
In Python programming language, the iteration statements , for loop, while loop and do-while loop, permit the arrangement of instructions to be repeatedly executed, till the condition is true and ends when the condition becomes bogus.
Where is condition checking written in a loop?
It allows initialization, condition checking and iteration statements are written on the top of the loop. It only allows initialization and condition checking at the top of the loop. Condition. It iterates infinite time, if no condition is given.
Can initialization be repeated?
If initialization is once done if “for” loop, it never be repeated. If initialization is done while condition checking, then it si required each time when the loop iterates itself. Iteration statement. As iteration is statement is written at the top, it will execute only after all the statements will be executed.
What is a while loop?
While loop. 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. There are some significant differences among for and while loops, which are clarified further with the assistance of a comparison chart. Different base for comparison.
When is the syntax executed in a for loop?
The syntax in the for loop will be executed only when the initialization statement is on the top of the syntax but in case of while loop, it doesn’t matter whether initialization statement finds anywhere in the syntax. The iteration will be executed on if the body of the loop executes. on the contrary, the iteration statement in while loop can be ...
What is the condition in a while loop?
The condition in while loop can be any boolean expression. When an expression returns any non-zero value, then the condition is true, and if the expression returns a zero value, the condition becomes false.
How often does the initialization statement in a for loop execute?
The initialization statement in the syntax of for loop executes only once at the start of the loop. Conversely, if while loop is carrying initialization statement in its syntax, then the initialization statement in the while loop will execute each time the loop iterates.
When to use a while loop?
The 'while' loop used only when the number of iteration are not exactly known. If the condition is not put up in 'for' loop, then loop iterates infinite times. If the condition is not put up in 'while' loop, it provides compilation error. In 'for' loop the initialization once done is never repeated.
Can you use more than one variable in a for loop?
For example, the for loop allows us to use more than one variable inside the loop in order to control it, and the use of converge function with ‘for’ loop. Conversely, with while loop we can not use many variations, that must be used with the standard syntax. There are some major differences between for and while loops, ...
What happens if you fail to put condition in for loop?
If you fail to put condition statement in for loop, it will lead to an infinite iteration of a loop. In contrast, if you fail to put condition statement in the while loop it will lead to a compilation error. The initialization statement in the syntax of for loop executes only once at the start of the loop.
Where is the iteration statement in a loop?
Iteration statement. In 'for' loop iteration statement is written at top , hence, executes only after all statements in loop are executed. In 'while' loop, the iteration statement can be written anywhere in the loop.
Is a comma a separator in Java?
Each statement is separated by other by a comma, in Java, a comma is a separator whereas, in C++, “comma” is an operator that can be used in any valid expression.
Types of loops in Python
In python, we have two different loop statements in order to loop over a piece of code in two different ways. They have the same functionality – i.e., they will execute a certain piece of code only if a condition is met. Yet, they differ in syntax and some other aspects.
The While Loop In Python
The while loop statement is used to repeat a block of code till a condition is fulfilled. When we don’t know the exact number of times, a loop statement has to be executed. We make use of while loops. This way, till the test expression holds true, the loop body will be executed.
The For Loop In Python
The for loop in python is used to iterate over a given sequence. The sequence can be a string, a list, a tuple, a set, a dictionary, etc. As long as the length of the sequence is not reached, it will iterate over that sequence. The for loop contains initialization, the test expression, and the increment/decrement expression in the C language.
For loop vs while loop python
The for loop and while loop are two different approaches to executing the loop statements in python. They both serve the same functionality of looping over a python code till a condition is being fulfilled. For loops and while loops differ in their syntax. In while loops, we have to mention only the condition before starting the loop.
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.
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 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.
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.
When to use for loop?
– The for loop is used when a user wants to do something for a specific number of times. It is an entry control statement used for the repeated execution of certain statements. This is preferable when we know exactly how many times the loop will be repeated in advance. The while loop, on the other hand, is used for indefinite loops, meaning we do not have any idea on exactly how many times the loop is going to be repeated. The while loop will continue to run infinite number of times until the condition is met.
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 are loops?
Loops basically allow us to terminate a statement or a group multiple times in a given condition.
While loop
In Python, while loop is basically used to know how many iterations are required.
For loop in Python
In Python, the for loop is used when the user knows the number of iterations that are required. The user knows how many times the statement that is available inside the loops needs to be terminated.
For loop vs while loop in Python
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Why is a for loop more appropriate?
In the case you showed, a for loop is more appropriate because it's what other programmers (including future you, hopefully) will expect to see there. Set the loop iterations to 10,000.
Can a compiler unroll a for loop?
1. Some optimizing compilers will be able to do better loop unrolling with a for loop, but odds are that if you're doing something that can be unrolled, a compiler smart enough to unroll it is probably also smart enough to interpret the loop condition of your while loop as something it can unroll as well. Share.
