What is the difference between for loop and while loop?

What is the difference between for loop 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. In ‘while’ loop, the iteration statement can be written anywhere in the loop.

Why is it called a for loop?

In computer science, a for-loop (or simply for loop) is a control flow statement for specifying iteration, which allows code to be executed repeatedly. The name for-loop comes from the word for, which is used as the keyword in many programming languages to introduce a for-loop.

What are the general features of a loop?

For loop is called as entry controlled loop. It has three clauses. Each clause is separated by a semicolon . If the clauses are not present, the semicolon act as place holders.

What are examples of control structures?

Flow of control through any given function is implemented with three basic types of control structures:

  • Sequential: default mode.
  • Selection: used for decisions, branching — choosing between 2 or more alternative paths.
  • Repetition: used for looping, i.e. repeating a piece of code multiple times in a row.

Can you put a while loop in a for loop?

All for loops can be written as while loops, and vice-versa. 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 a control statement in Java?

A control statement in java is a statement that determines whether the other statements will be executed or not. It controls the flow of a program. An ‘if’ statement in java determines the sequence of execution between a set of two statements.

What are the unique features of FOR loop?

What are the unique features of for loop?

  • The initialization expression initializes the loop control variable and is executed only once when the loop starts.
  • The conditional expression is tested at the start of each iteration of the loop.
  • The increment/decrement expression updates the loop control variable after each iteration.

What is switch statement example?

Switch statement in C tests the value of a variable and compares it with multiple cases. Each case in a block of a switch has a different name/number which is referred to as an identifier. The value provided by the user is compared with all the cases inside the switch block until the match is found.

What is the for each loop in Java?

The Java for-each loop or enhanced for loop is introduced since J2SE 5.0. It provides an alternative approach to traverse the array or collection in Java. It is mainly used to traverse the array or collection elements. It is known as the for-each loop because it traverses each element one by one.

What is for loop used for?

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.

What is the use of input statement?

Use the INPUT statement to halt program execution and prompt the user to enter a response. Data entered at the terminal or supplied by a DATA statement in response to an INPUT statement is assigned to variable.

How for each is different from for loop in Java?

A loop is a control statement which executes a particular block of code repeatedly until a given condition becomes false. There are various types of loops such as while, do-while and for loop. In this article, we will be focusing on for loop and its enhanced version.

What is a Do While loop in programming?

In most computer programming languages, a do while loop is a control flow statement that executes a block of code at least once, and then either repeatedly executes the block, or stops executing it, depending on a given boolean condition at the end of the block.

How does while loop start?

First, we set a variable before the loop starts (var i = 0;) Then, we define the condition for the loop to run. As long as the variable is less than the length of the array (which is 4), the loop will continue. Each time the loop executes, the variable is incremented by one (i++)

What is basic input statement?

In True BASIC, the simplest way to obtain data from the user is the INPUT statement. The data provided by the user may consist of numeric or string values, and it may come from the keyboard or a file.

Which is true of do loop?

A “Do While” loop statement runs while a logical expression is true. This means that as long as your expression stays true, your program will keep on running. Once the expression is false, your program stops running.

What are the control statements?

A control statement is a statement that determines whether other statements will be executed. An if statement decides whether to execute another statement, or decides which of two statements to execute. for loops are (typically) used to execute the controlled statement a given number of times.

What are the 3 types of loops in Java?

Java provides three repetition statements/looping statements that enable programmers to control the flow of execution by repetitively performing a set of statements as long as the continuation condition remains true. These three looping statements are called for, while, and do… while statements.

Can we use while loop inside for loop in Java?

Note: It is possible to use one type of loop inside the body of another loop. For example, we can put a for loop inside the while loop.

What is a Do While loop algorithm?

Do While Loop Flow Chart Execute/Run a group of statements within the C Programming loop. Next, use Increment and Decrement Operator inside the loop to increment or decrements the values. Next, it checks the while condition. If the condition output is True, the code inside the C Do while loop executes again.

How does while loop work?

Overview. The while construct consists of a block of code and a condition/expression. This repeats until the condition/expression becomes false. Because the while loop checks the condition/expression before the block is executed, the control structure is often also known as a pre-test loop.

What are the loop control statements?

With loop control statements, you can repeatedly execute a block of code. There are two types of loops: for statements loop a specific number of times, and keep track of each iteration with an incrementing index variable.

What do you mean by for each loop?

Foreach loop (or for each loop) is a control flow statement for traversing items in a collection. Foreach is usually used in place of a standard for loop statement.

What is computer control structure?

A control structure is like a block of programming that analyses variables and chooses a direction in which to go based on given parameters. The term flow control details the direction the program takes (which way program control “flows”). Hence it is the basic decision-making process in computing; It is a prediction.

What type of loop is a while loop?

While Loop in C It is an entry-controlled loop. In while loop, a condition is evaluated before processing a body of the loop. If a condition is true then and only then the body of a loop is executed.

What are the 3 parts of a for loop?

Similar to a While loop, a For loop consists of three parts: the keyword For that starts the loop, the condition being tested, and the EndFor keyword that terminates the loop.