SOY learning - c# for beginners
Lesson4: for loop, break and continue keywords
>for
It is a loop that repeats an action you coded, using 3 statements to operate:
<Statement 1 - sets up an iterator with a certain value
<Statement 2 - sets up a condition for the iterator - as long as the iterator meets the condition, the loop will perform the action again and again
<Statement 3 - sets up an action for the iterator - every time the loop acion is executed, a set action is done to the iterator
^example
for (int i = 0; i < 10; i++)
{
Insert code here;
}
^end example
In the example, with statement 1 we set up the iterator - int i that has a set value 0. Statement 2 sets up the condition for the loop - as long as int i's value is below 10, the loop will perform the code. Statement 3 sets up the iterator action - every time the loop code is performed, int i's value goes up by 1 (from the ++ operator). 
Basically, int i starts with 0, and with every loop action it goes up by 1. The loop stops when int i = 10 because the condition for the loop is for i to be below 10
Uniquely enough, for can act wihout specifying some (or all) statements
^example
for (;;)
{
code;
}
^end
In this case, for doesn't have a single statement, making an infinite loop (BUT! You still have to put two ; even if there are statements missing, no matter what)
^example 2
int i = 0
for (; i < 5; i++)
{
Code1;
}
for (; i < 10; i++)
{
code2;
}
^end
In this case, we have int i as a separate value instead of being bound to the loops. Still, since both loops have statements 2 and 3 where they use i, int i will be used in both of them. First loop will act until i = 5, increasing i by one every time from 0 to 5. The second loop will start after the first loop, acting untill int i = 10, increasing i by one from 5 to 10 and stopping when i = 10
break
It is a keyword that can end a cycle prematurely
^example
for (int i; i < 100; i++)
{
Code;
if (i == 10)
{
break;
}
}
^end
In this example, we have a for loop that will perform the code until int i = 100. However, inside the loop we also have the if() construction that acts up when int i = 10 - it uses break key word, ending the for loop prematurely before i reaches 100 (statement 2)
>continue
A key word that continues a cycle
^example
for (int i; i < 100; i++)
{
if (i == 10)
{
continue;
}
Console.WriteLine(i);
}
^end
The for loop starts, but this time if() stops the cycle when i = 10 and then continues it. 
<NOTE! By stopping the for loop like that, if() stops the for loop from performing the code that would otherwise happen when i would reach 10, and then continues the for loop with i reaching 11, 12, etc. So the code doesn't perform when i = 10, but then continues to perform like normal.
<In this case, our main code in the for loop is Console.WriteLine(i) - it writes the i value in the console every loop: 1, 2, 3… When i = 10, if() uses the continue keyword and stops the loop, so in the console we won't see 10. After momentary stopping, if() allows the loop to continue, so we'll go to the next iiteration, 11, then 12, 13….