Which loop is best for or while loop?
Use a for loop when you know the loop should execute ntimes. 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. If you have a different set of rules for picking between the two, then share them in the comments below.
When to use the for loop over the 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 to convert for loop into while loop?
- Write a program to print one asterisk.
- Modify that program to print three asterisks, all in a line, using a single print statement.
- Modify that program to print three asterisks, all in a line, using three print statements.
Can for loop be replaced by DO WHILE LOOP?
Some languages like LabView do not have “variables” for For loops, thus do not allow the loop value to be modified, so For can be replaced with While easily enough, but vice versa is anything from simple to impossible depending on the exit condition. “Loop forever” is impossible in LabView with a For loop. Usually yes, but not always easily.
What is difference between for and while loop?
The 'for' loop used only when we already knew the number of iterations. 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.
Which is better for 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.
What is the difference between for loop and?
If the condition is not mentioned in the 'for' loop, then the loop iterates infinite number of times. The initialization is done only once, and it is never repeated. The iteration statement is written at the beginning. Hence, it executes once all statements in loop have been executed.
What are the basic differences between while do while and for loop?
Difference Between while and do-while loop in C, C++, JavaParameterswhileChecking of ConditionIt first needs to check the condition, and only then can we execute the statement(s).ControllingThe while loop is an entry-controlled type of loop.3 more rows
Which is faster while or for?
Efficiency, and While vs For Using for: % Time elapsed: 0.0010001659 seconds. Using while: % Time elapsed: 0.026000023 seconds. The main reason that While is much slower is because the while loop checks the condition after each iteration, so if you are going to write this code, just use a for loop instead.
Which loop is fastest in C language?
"Do-While loop is the fastest loop in C programming".
What is while loop example?
A "While" Loop is used to repeat a specific block of code an unknown number of times, until a condition is met. For example, if we want to ask a user for a number between 1 and 10, we don't know how many times the user may enter a larger number, so we keep asking "while the number is not between 1 and 10".
What are the 3 types of loops?
In Java, there are three kinds of loops which are – the for loop, the while loop, and the do-while loop. All these three loop constructs of Java executes a set of repeated statements as long as a specified condition remains true. This particular condition is generally known as loop control.
Why is a for loop more powerful than a while loop?
A for loop is more structured than the while loop. The keyword for is used, followed by three statements: initialization: executed before the loop begins. expression: evaluated before each iteration, exits the loop when false.
When should you use a while loop?
A "While" Loop is used to repeat a specific block of code an unknown number of times, until a condition is met. For example, if we want to ask a user for a number between 1 and 10, we don't know how many times the user may enter a larger number, so we keep asking "while the number is not between 1 and 10".
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
When should I use a for loop?
A "For" Loop is used to repeat a specific block of code a known number of times. For example, if we want to check the grade of every student in the class, we loop from 1 to that number. When the number of times is not known before hand, we use a "While" loop.
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.
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.
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.
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.
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.
What is a do while loop in C++?
In C++ and Java, the iteration statements, for loop, while loop and do-while loop, allow the set of instructions to be repeatedly executed, till the condition is true and terminates as soon as the condition becomes false. Conditions in iteration statements may be predefined as in for loop or open-ended as in while loop.
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.
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.
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.
Where does the iteration statement execute?
The iteration statement in the for loop will execute after the body for loop executes. On the contrary, the iteration statement can be written anywhere in the body of while loop so, there can be some statements that execute after the execution of iteration statement in the body of while loop.
Do you need curly braces for a while loop?
May it be a for loop or a while loop, if there is only one statement in the body of the loop, the curly braces are not required in that condition.
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 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 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 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 a For Loop in Java?
The “for” loop in Java is a function that is used when you know how many times you need to run it . The iteration generally allows a programmer to come up and execute any specific statement and attain a final condition.
What is a While Loop in Java?
While loop in java can be defined as a control flow statement that allows a programmer to execute a code repeatedly on the basis of a given specific Boolean condition.
Difference Between For and While Loop in Java
In the case of "for loop," the syntax can be executed only when the iteration sits on the very top of the syntax. In comparison, the location of the iteration doesn't matter for the syntax of the "while" loop to get executed.
Similarities: How "for" loop is similar to the "while" loop in Java
Yes, it is true that "for" loop and "while" loop are pretty distinct in multiple aspects, but again you can't take away the fact that both "for" loop and "while" loop are iteration statements and are used to satisfy a specific condition.
Frequently Asked Questions
The answer to this question depends upon the situation you’re in. At times you’ll find yourself executing a statement that needs the initialization of the “for” loop and vice versa.
Conclusion
Although the "for" loop and "while" loop are both iterations, there are a number of elements that sit uncommonly. In this article, we've walked through all of those to help you understand what actually differentiates the former from the latter.
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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