ENTRY - CONTROLLED LOOP EXAMPLE
Consider the following code fragment:
:
for(int a=1;a<=10;a++)
{
while loop and for loop are entry controlled loops as they check looping condition at the entry point. do while loop is exit controlled loop as it checks looping condition at exit point. shreeradha@yahoo.com
Executing a segment of a program repeatedly by introducing a counter and later testing it using the if statement.A sequence of statements are executed until some conditions for termination of the loop are satisfied.A Program loop consists of two segments:1.Body of the loop2. Control StatementDepending on the position of the control statement in the loop, a control strcture may be classifies either as the 2:Entry Controlled LoopExit Controlled Loop1.Entry Control Loop-(Pre Test Loop)The control conditions are tested before the start of the loop execution.If the conditions are not satisfied , then the body of the loop will not be executed.]eg:While Loop2.Exit Control Loop-(Post Test loop)The Test is performed at the end of the body of the loop and there fore the body is executed unconditionally for the first time.eg:Do-Whilewhile loopfor loopdo-while loop
The only loop that does not require an entry condition is the procedural goto loop: again: /*...*/ goto again; Although a do-while loop has no entry condition per-se, it still requires a mandatory entry condition into the second and all subsequent iterations. do { /*...*/} while (true); // mandatory entry condition into all but the 1st iteration And although a for loop's condition is optional, it is implicit: for (;;) {/*..*/} // implicit for ever loop for (;true;) {/*...*/} // explicit for ever loop
a loop consist of data initialization;test condition;updation; example a for loop for(int a=1;a<5;a++) the loop will be executed 5 times four positives result and the last test condition will be failed and the loop will be exited there are many loops some of them are while loop,do...while loop,for loop,maybe more...... do while is an exit check loop and while and for are entry check loop.
Control variable which is used in control structures.e.g. for(int i=0;i
while loop and for loop are entry controlled loops as they check looping condition at the entry point. do while loop is exit controlled loop as it checks looping condition at exit point. shreeradha@yahoo.com
A cruise control is an example of a closed loop servo.
An entry control loop places the conditional expression that terminates the loop at the start of the loop, where it is evaluated before each iteration of the loop. If the expression initially evaluates false, then the loop does not iterate at all and control passes to the next statement following the loop. An exit control loop places the conditional expression at the end of the loop, where it is evaluated after each iteration of the loop. This means that the loop always iterates at least once. Generally, exit control loops are best avoided as conditional expressions are ideally placed up front where they can be seen. This helps make code easier to read and thus easier to maintain. However, there will inevitably be cases where an exit control loop helps to express the logic more clearly. In C there are 3 ways to define a structured iterative loop, using the for, while and do-while statements. Although for and while loops are entry control loops and do-while is an exit control loop, conditional expressions may also be placed anywhere in the body of the loop itself, thus it is possible for a loop to be both entry control and exit control. However, to aid readability and maintainability, it is best to place the conditional expression up front whenever possible.
Executing a segment of a program repeatedly by introducing a counter and later testing it using the if statement.A sequence of statements are executed until some conditions for termination of the loop are satisfied.A Program loop consists of two segments:1.Body of the loop2. Control StatementDepending on the position of the control statement in the loop, a control strcture may be classifies either as the 2:Entry Controlled LoopExit Controlled Loop1.Entry Control Loop-(Pre Test Loop)The control conditions are tested before the start of the loop execution.If the conditions are not satisfied , then the body of the loop will not be executed.]eg:While Loop2.Exit Control Loop-(Post Test loop)The Test is performed at the end of the body of the loop and there fore the body is executed unconditionally for the first time.eg:Do-Whilewhile loopfor loopdo-while loop
Doing sex is an example of open loop so in this system u cannot control the amount of sperms entering your partner
The only loop that does not require an entry condition is the procedural goto loop: again: /*...*/ goto again; Although a do-while loop has no entry condition per-se, it still requires a mandatory entry condition into the second and all subsequent iterations. do { /*...*/} while (true); // mandatory entry condition into all but the 1st iteration And although a for loop's condition is optional, it is implicit: for (;;) {/*..*/} // implicit for ever loop for (;true;) {/*...*/} // explicit for ever loop
C, for loops, while loops, and do while loops are control structures forFor example, the following programs are functionally identical: While loop
a loop consist of data initialization;test condition;updation; example a for loop for(int a=1;a<5;a++) the loop will be executed 5 times four positives result and the last test condition will be failed and the loop will be exited there are many loops some of them are while loop,do...while loop,for loop,maybe more...... do while is an exit check loop and while and for are entry check loop.
An exit-controlled loop is a loop where the controlling conditional expression is evaluated at the end of each iteration, as opposed to an entry-controlled loop where the expression is evaluated at the beginning of each iteration. The upshot is that an exit-controlled loop always executes at least one complete iteration whereas an entry-controlled loop might not iterate at all: int x = 100; // entry-controlled loop while (x<50) { printf ("%d\n", x++); // won't execute at all because x<50 is false } // exit-controlled loop do { printf ("%d\n", x++); // will execute one time only } while (x<50);
Control variable which is used in control structures.e.g. for(int i=0;i
The for loop is another entry-controlled loop that provides a more concise loop control structure.The general form of the for loop isfor( initialization ; test condition ; increment ){body}Generally this loop is used when the either the no. of loops or the looping condition or the end condition is known.Ex.to count n no. of integers.Hope this will help.
it is when a control loop is open and processing