Page 64 - Programming the Photon Getting Started With the Internet of Things

for loop header:

for (initialization; condition; increment) {
statements
}

for (int x = 0; x < 10; x++) {
delay(500);
}

The initialization happens first and only once; each time through the loop, the
condition is tested. If it is true, then the statements are executed, as well as the
increment, and then the condition is tested again. The condition becomes false when the

loop has repeated more than 10 times.

while Loops

Another useful way of looping in C is to use the while command in place of the for
command. while loops will loop continuously until the expression inside the parentheses

() becomes false. Something has to change the tested variable; otherwise, the while loop
will never end and will run indefinitely. The syntax for using a while loop is as follows:

while(expression) {
statements
}

int i = 0;
while (i = < 10)
{

delay(500);
i ++;
}

The expression in the parentheses after the while must be true to stay in the loop. When it
is no longer true, then the sketch continues running the commands after the curly braces.
You may also notice the following line:

i ++;

This is just C shorthand for the following expression:

i = i + 1;

Arrays