for-endfor

The lines between a for-endfor statement will be executed as long as the
middle expression in the for-statement is true. The for expression consists
of three expression, delimited by semicolon and surrounded by parentheses.
The first expression will be executed the before the first loop, the third
will be executed after every loop, the middle is executed before every loop
and if it is true, another loop is done, if false the loop is leaved.

Example

for ( i = 0; i < 10; i++)

    a += b;

endfor