This was the first programming language with comments. The statement function is used and the backward loop has to be simulated, since a backward loop (negative index) was not permitted, and neither was index zero. The conditional statement is the arithmetical one, with jumps to three different positions depending on whether the arithmetic expression is less than zero, equal to zero or greater than zero. All function names have to end with an F. It is possible to print character strings if you can give the number of characters which will be output (10H in the case when ten characters are to be outputted). Structured layout had not yet been invented.