All function names have to end with an F . Structured layout had not yet been invented. Also here a statement function is being used and the backward loop is still simulated. The structured layout has been used. The backward loop no longer has to be simulated and the conditional statement can be given in a more natural way.
Structured layout is now the normal case.
The character string can be given within apostrophes so that you no longer have to count manually the number of characters in the character string. The statement END in the main program is also being used for the execution so that STOP is no longer required. Instead of an external function a local function is now used. The backward loop has not to be simulated. The specifications have a new appearance.