What is the for loop in c plus plus?

Answer 1

In C, also in C++, the for loop executes zero or more times, until the test expression is false...

for (init-expression; test-expression; loop-expression) statement;

/* init-expression executed once, at beginning */

/* statement executes zero or more times, until test-expression is false, test first */

/* loop-expression evaluated at end of each iteration */

Answer 2

for (<init>; <test>; <iterate>) <statement>

<init> is executed once. <test> is then executed - if it has value true (!= 0), then <statement> is executed. Then <iterate> is executed. Then the sequence repeats from the <test> statement. Each of <init>, <test>, <iterate>, and <statement> can be null, and <statement> can be a compound statement. If <test> is false (==0) the first time, then neither <statement> nor <iterate> is executed.

Answer 3

syntax:

for (; ; )

meaning:

;

while () {

;

}

example:

for (i=0, j=10; i

tmp= array[i];

array[i]= array[j];

array[j]= tmp;

}

Answer 4

for( initial-expression ; conditional-expression ; loop-expression )

{

statement;

}

All expressions are optional, as is the statement body, but semi-colon separators must be present. Multiple expressions are separated by commas.

The initial-expression is executed before entering the loop for the first time only. The conditional-expression is evaluated before entering the loop every time. The loop-expression is executed at the end of each iteration, immediately before the conditional-expression is re-evaluated.

Loop-expressions that increment or decrement values should always use the prefix operators (++x or --x) unless the previous value is required as part of the loop-expression. This is vital when the values are complex objects, to avoid unnecessary temporary variables from being created.

Infinite loops are created with the following:

for( ;; )

{

statement;

if( conditional_expression )

break; // You must include some conditional expression to break from the loop.

}

The continue keyword can also be used with a conditional-expression to start a new iteration at any point in the loop, skipping any remaining statements within the loop.

Answer 5

i dont no answer