Loops
A Loop is a way of making a program repeat some actions over and over again, usually a specific number of times. The draw() function already is a loop, in fact; but you can also use a loop to do repetitions within the draw function.the FOR loop
In a for loop, you use a variable (often called i), and give it a range of values. Each time the value of that variable changes, you repeat the block of code in the loop. Here's an example
int i;
// counting
for (i=1;i<10;i=i+1)
{
println(i);
}
the for loop has three parts, separated by semicolons: for ( start value ; condition ; increment)
"i=1" means that the variable will start at 1. "i < 10" means that the loop continues while i is less than 10. "i=i+1" means that each time through the loop, we add 1 to i.
Notice that the loop above only counts from 1 to 9, not 1 to 10. When i=10, the loops ends.
Counting 1 to 10
for (i=1;i<=10;i=i+1)
{
println(i);
}
Counting by twos
for (i=1;i<=10;i=i+2)
{
println(i);
}
Counting backwards
for (i=10;i>0;i=i-1)
{
println(i);
}
Using the increment operator shortcut
for (i=0 ; i < 10 ; i++)
{
println(i);
}