Loops are among the most basic and powerful of programming concepts. A loop in a computer program is an instruction that repeats until a specified condition is reached. In a loop structure, the loop asks a question. If the answer requires action, it is executed. The same question is asked again and again until no further action is required. Each time the question is asked is called an iteration.
A computer programmer who needs to use the same lines of code many times in a program can use a loop to save time.
For Loop Example In Dev C++
Just about every programming language includes the concept of a loop. High-level programs accommodate several types of loops. C, C++, and C# are all high-level computer programs and have the capacity to use several types of loops.
Unlike for and while loops, which test the loop condition at the top of the loop, the do.while loop checks its condition at the bottom of the loop. A do.while loop is similar to a while loop, except that a do.while loop is guaranteed to execute at least one time. Notice that the conditional. Apr 11, 2020 An infinite loop is also called as an 'Endless loop.' Following are some characteristics of an infinite loop: 1. No termination condition is specified. The specified conditions never meet. The specified condition determines whether to execute the loop body or not. 'C' programming language provides us with three types of loop constructs: 1. Dec 20, 2008 29 videos Play all C Programming Tutorials from thenewboston thenewboston C Programming Tutorial - 26 - do while Loops - Duration: 10:43. Thenewboston 219,829 views. Continue is another keyword that controls the flow of loops. If you are executing a loop and hit a continue statement, the loop will stop its current iteration, update itself (in the case of for loops) and begin to execute again from the top. C while loops statement allows to repeatedly run the same block of code until a condition is met. While loop is a most basic loop in C. While loop has one control condition, and executes as long the condition is true.
Types of Loops
- A for loop is a loop that runs for a preset number of times.
- A while loop is a loop that is repeated as long as an expression is true. An expression is a statement that has a value.
- A do while loop or repeat until loop repeats until an expression becomes false.
- An infinite or endless loop is a loop that repeats indefinitely because it has no terminating condition, the exit condition is never met or the loop is instructed to start over from the beginning. Although it is possible for a programmer to intentionally use an infinite loop, they are often mistakes made by new programmers.
- A nested loop appears inside any other for, while or do while loop.
A goto statement can create a loop by jumping backward to a label, although this is generally discouraged as a bad programming practice. For some complex code, it allows a jump to a common exit point that simplifies the code.
Loop Control Statements
A statement that alters the execution of a loop from its designated sequence is a loop control statement. C#, for example, provides two loop control statements.
- A break statement inside a loop terminates the loop immediately.
- A continue statement jumps to the next iteration of the loop, skipping any code in between.
Basic Structures of Computer Programming
Loop, selection, and sequence are the three basic structures of computer programming. These three logic structures are used in combination to form algorithms for solving any logic problem. This process is called structured programming.
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Unlike for and while loops, which test the loop condition at the top of the loop, the do...while loop checks its condition at the bottom of the loop.
A do...while loop is similar to a while loop, except that a do...while loop is guaranteed to execute at least one time.
Syntax
The syntax of a do...while loop in C++ is −
Notice that the conditional expression appears at the end of the loop, so the statement(s) in the loop execute once before the condition is tested.
How To Use For Loop In Dev C++
If the condition is true, the flow of control jumps back up to do, and the statement(s) in the loop execute again. This process repeats until the given condition becomes false.
Flow Diagram
For Loop In C Programming
Example
When the above code is compiled and executed, it produces the following result −
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