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Is the for loop a pretest type of loop?
Pretest loops, such as for-loop, while-loop, execute/evaluate the condition statement first, if the condition is met, then the statements of the loop are executed. If you were referring to the body of the loop being carried out at least once, no, the body will not be touched if the condition fails (pre-test, test BEFORE the [next] execution of the body). But the condition of the loop must have been evaluated at least once.In contrast to the post-test loops, such as do-while, repeat-until, the condition is evaluated AFTER the [next] execution of the body. It is possible that the condition is never evaluate, and not the entire loop body being executed.
Does The statements within a while loop execute at least once?
No. If the loop condition is not satisfied then the loop would not be executed even once. while(condition) { ..... /statements ..... } here,when the condition is true then the statements will be executed. Otherwise they would be skipped without being executed. Only for do.. while loops this execution at least once holds good.
What is expression that is executed by the for loop only once regardless of the number of iterations?
In a for loop, the expression that is executed only once, regardless of the number of iterations, is the initialization expression. This expression is typically found at the beginning of the loop's syntax and is used to initialize the loop variable. For example, in the loop for (int i = 0; i < n; i++), the initialization int i = 0 is executed just once before the loop begins iterating.
What happens if the controlling expression in a do while loop is initially false?
The do-while loop is designed specifically for such situations, where you want the loop to execute once irrespective of the loop expression. The loop would execute once and then terminate because, the loop controlling expression is false. If you note the syntax properly do { ... ... ... } while(condition) The condition is executed only after one iteration of the loop and hence the code would execute once irrespective of the loop expression result.
Difference between while loop and do loop?
The difference between "do while" and "do until" is that a "do while" loops while the test case is true, whereas "do until" loops UNTIL the test case is true (which is equivalent to looping while the test case is false).The difference between a "do ...while" loop and a "while {} " loop is that the while loop tests its condition before execution of the contents of the loop begins; the "do" loop tests its condition after it's been executed at least once. As noted above, if the test condition is false as the while loop is entered the block of code is never executed. Since the condition is tested at the bottom of a do loop, its block of code is always executed at least once.To further clear your concept on this, understand the syntax and description of the two loop types:whileThe while loop is used to execute a block of code as long as some condition is true. If the condition is false from the start the block of code is not executed at al. The while loop tests the condition before it's executed so sometimes the loop may never be executed if initially the condition is not met. Its syntax is as follows.while (tested condition is satisfied){block of code}In all constructs, curly braces should only be used if the construct is to execute more than one line of code. The above program executes only one line of code so it not really necessary (same rules apply to if...else constructs) but you can use it to make the program seem more understandable or readable.Here is a simple example of the use of the while loop. This program counts from 1 to 100.#include int main(void){int count = 1;while (count
What are the difference bitween while and do-while statement in c language?
While loop will be executed only the specified conditions atisfies. Do-While loop executes atleast once before checking for condition. So even a condition fails, the loop will be executed once.
Difference between do while and for loop?
for loop it consists of 3 parts 1. initialization 2. condition 3. incrementation like for(i=1;i<=10;i++).This loop executes 10 times. While loop: This is an entry check loop. First it checks for the condition and if the condition is true then only loop will be executed and this continues till the condition becomes false. ex: i=0; while(i<10) {i++; } This loop executes 10 times. Do loop: This is an exit check loop. This executes the loop at least once even when the condition is false. ex: 1=0; do { i++; }while(i<10);
Is the for loop a pretest type of loop?
Pretest loops, such as for-loop, while-loop, execute/evaluate the condition statement first, if the condition is met, then the statements of the loop are executed. If you were referring to the body of the loop being carried out at least once, no, the body will not be touched if the condition fails (pre-test, test BEFORE the [next] execution of the body). But the condition of the loop must have been evaluated at least once.In contrast to the post-test loops, such as do-while, repeat-until, the condition is evaluated AFTER the [next] execution of the body. It is possible that the condition is never evaluate, and not the entire loop body being executed.
Does The statements within a while loop execute at least once?
No. If the loop condition is not satisfied then the loop would not be executed even once. while(condition) { ..... /statements ..... } here,when the condition is true then the statements will be executed. Otherwise they would be skipped without being executed. Only for do.. while loops this execution at least once holds good.
What is expression that is executed by the for loop only once regardless of the number of iterations?
In a for loop, the expression that is executed only once, regardless of the number of iterations, is the initialization expression. This expression is typically found at the beginning of the loop's syntax and is used to initialize the loop variable. For example, in the loop for (int i = 0; i < n; i++), the initialization int i = 0 is executed just once before the loop begins iterating.
What happens if the controlling expression in a do while loop is initially false?
The do-while loop is designed specifically for such situations, where you want the loop to execute once irrespective of the loop expression. The loop would execute once and then terminate because, the loop controlling expression is false. If you note the syntax properly do { ... ... ... } while(condition) The condition is executed only after one iteration of the loop and hence the code would execute once irrespective of the loop expression result.
What are the differencess between while and do while repetition structures?
If a loop begins with "while" then the test is made at the top of the loop, and the block is executed only when the expression (in parentheses) evaluates to true; if the loop begins with "do" then the block is executed at least once, and the "while" test is made at the bottom of the loop, to determine whether it is executed again. In C/C++ the test at the end is a "while" keyword. However, in some other languages, the test at the end may use an "until" keyword, so that the block is repeated only when the condition is false and the loop exits when it is true.
Difference between while loop and do loop?
The difference between "do while" and "do until" is that a "do while" loops while the test case is true, whereas "do until" loops UNTIL the test case is true (which is equivalent to looping while the test case is false).The difference between a "do ...while" loop and a "while {} " loop is that the while loop tests its condition before execution of the contents of the loop begins; the "do" loop tests its condition after it's been executed at least once. As noted above, if the test condition is false as the while loop is entered the block of code is never executed. Since the condition is tested at the bottom of a do loop, its block of code is always executed at least once.To further clear your concept on this, understand the syntax and description of the two loop types:whileThe while loop is used to execute a block of code as long as some condition is true. If the condition is false from the start the block of code is not executed at al. The while loop tests the condition before it's executed so sometimes the loop may never be executed if initially the condition is not met. Its syntax is as follows.while (tested condition is satisfied){block of code}In all constructs, curly braces should only be used if the construct is to execute more than one line of code. The above program executes only one line of code so it not really necessary (same rules apply to if...else constructs) but you can use it to make the program seem more understandable or readable.Here is a simple example of the use of the while loop. This program counts from 1 to 100.#include int main(void){int count = 1;while (count
Is it possible to use a for loop in place of a while loop?
Yes. while loop consist of only condition statement to make for loop look as while loop we can use syntax shown below: for(;condition;) eg: for(;i<=n;)
Definition and comments for loop?
The C and C++ for loop is defined as...for (init-expression; test-expression; loop-expression) loop-statement;The init-expression is executed once.At the top of the loop, test-expression is evaluated. If it is false, control passes to the statement following loop-statement.The loop-statement is executed. It may be one statement, it may be a block of statements, or it may be no statement. If it is no statement, the semi-colon is required.At the bottom of the loop, loop-expression is executed, and then control passes to the test-expression at the top of the loop for another go-around.Each of init-expression, test-expression, and loop-expression may be missing. The semi-colons are required. The formal "forever" loop is for (;;) loop-statement; in which case the only way out is the break statement.Since each of init-expression, test-expression, and loop-expression can have side-effects, sometimes a loop is constructed with no loop-statement, and all processing is done between the parentheses.If test-expression is initially false, loop-expression and loop-statement are never executed. The init-expression is always executed only one time, and test-expression is executed at least one time.At any point during loop-statement, the breakstatement will exit to the statement following loop-statement, and the continue statement will jump to the loop-expression at the bottom of the loop.
Which loop does not have an entry condition in C plus plus?
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
What r conditional loops and unconditional loops in c?
A conditional loop will only continue to loop while the given condition is true: while( i < 10 ) { ... } An unconditional loop either has no condition (a GOTO loop), or the condition is guaranteed to always evaluate to true: while( true ) { ... }
