How do you call repeat/recursive in C#? - Page 2 - Overclock.net

kdbolt70 · 12-16-07

Quote:

Originally Posted by Licht

Code:

for(int i=0; i<6; i++){
    //do something
}

I wanna focus on this, i have a few questions. What exactly is the syntax for this?

Code:

for(first argument; 2nd argument; 3rd argument)

What exactly gos in for each argument? Is it always used to initiate a variable, run a check, then perform a mathematical change to the variable?

The syntax of a for loop is fairly simple, it is:

for(executed before; conditional statement; run after each iteration)

so something like:

Code:

for(int i = 0; i < 10; i++){
   cout << i << endl;
}

this means the int i = 0; is run before the loop starts. This is usually an intializer for the counting variable. The middle statement is checked before every iteration. If the condition is not met (i.e. if i is greater than or equal to 10) then the loop will end. Lastly, the final one is what is run after every iteration. This is usually an incrementer of your counting variable.

The for loop is not actually a function like it looks. Its (I believe) a macro that gets turned into a while loop behind the scenes.

Ironically, you can actually do:

Code:

for(;;){
}

and it is correct. this will just run an infinite loop. there is no conditional statement to break it out of.

Edit: Bah, to slow on the stick. Nice job Polska.

Licht · 12-16-07

Quote:

Originally Posted by Polska

The general Syntax would be:

syntax:
for (statement1; expression; statement2)
statement[s]3

curly brackets used to nest several statements
for (statement1; expression; statement2) {
statement3;
statement4;
statement5;
}

statement2 doesn't necessarily have to correlate to statement1, but generally it is. You could however write

for (int i = 0; i < 6; ) {
Console.WriteLine("hi");
i++;
}

and it is equivalent to;

for (int i = 0; i < 6; i++) {
Console.WriteLine("hi");
}

Ok so the arguments for the for loop are

Code:

for(any statement;expression determining when to break without being called;any statement)

?

kdbolt70 · 12-16-07

Quote:

Originally Posted by Licht

Ok so the arguments for the for loop are

Code:

for(any statement;expression determining when to break without being called;any statement)

?

Correct. Thought the first "any statement" will only be run before the loop starts, and the second will be run after each iteration.

Licht · 12-16-07

Quote:

Originally Posted by kdbolt70

Correct. Thought the first "any statement" will only be run before the loop starts, and the second will be run after each iteration.

Ok so,

Code:

for(run at start; continue if true; run every cycle)

Right?

And

Code:

<variable>++

Means

Code:

<variable> += 1

Polska · 12-16-07

Here is a more formal definition from a book I have.

Quote:

for(initial; boolean-expression; loop)
statement

The initial expression performs operation that precede the first iteration. The initial expression does not have to be a declaration of a new variable. It is possible, for example, to declare the variable beforehand and simply initialize it in the for loop. Variables declared here, however are bound within the scope of the for statement.
The boolean-expression portion of the for loop specifies an end condition. The for loop will repeat only as long as boolean-expression evaluates to true.
The loop expression executes after each iteration.
The statement portion of the for loop is the code that executes while the conditional expression remains true.

Licht · 12-16-07

Quote:

Originally Posted by Polska

Here is a more formal definition from a book I have.

Handy.

kdbolt70 · 12-16-07

Quote:

Originally Posted by Licht

Ok so,

Code:

for(run at start; continue if true; run every cycle)

Right?

And

Code:

<variable>++

Means

Code:

<variable> += 1

Nail on the head my friend.

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How do you call repeat/recursive in C#?

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