Cycle

Sometimes, we may need to execute the same piece of code many times. Generally,program statements are executed sequentially: the first statement in a function occurs first, followed by the second statement, and so on.

Programming languages provide multiple control structures for more complex execution paths.

Loop statements allow us to execute a statement or group of statements multipletimes, and the following is a flowchart of loop statements in most programming languages:

cyclical patterns

The C language provides the following loop types. Click on the link to view each type for details.

cyclical patterns	description
while recurrence	Repeat statements or group of statements when a given condition is true. It tests the condition before executing the loop host.
for recurrence	Performing a sequence of statements multiple times, simplifying the code that manages loop variables.
do…while recurrence	similar to the while statement except that it test condition at the end of the loop subject.
nest loop	Use one or more loops in the loop of while, for or do… while

Statement of loop control

 The loop-control statement changes the order that code is executed. With it you can jump in the code.

C language provide the following loop control statements. Click on the link to see the details of each statement.

control statement	description
break sentence	To terminate the loop or switch statement, the program stream continues to execute the next statement which following the loop or switch.
continue Statement	Tell loop body to stop the cycle  immediately and start the next cycle again.
goto sentence	Transfer the control to the tagged statement. But do not recommend using the goto statement in a program.

infinite loop

If the conditions are never false, then the loop becomes an infinite loop. The for cycle can be used to realize infinite cycles in the traditional sense . Since any of the three expressions that constitute a loop is not a must, you can leave some conditional expressions blank to form an infinite loop.

living example

 A conditional expression is assumed to be true when it does not exist. You can also set an initial value and an incremental expression, but in general, the C programmer tends to use the for (;;) structure to represent an infinite loop.

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