ted,thetextfileprogramparameterOutr .. t. isassumed. Page (f) isanerroriff is undefined or if f is not in generation: node. 

## Pred(x) 

a ordinal function that returns the pre IOUS ordinal value (predecessor) before the ordinalparameterx,ifapredecessorexi.ls: ord(pred(x)) = ord(x) - 1. P red (x) is an error if x is the smalle' I value of its type. 

## Put (f) 

a file-handling procedure that appends the value of f" to the end of the sequence of f. Put (f) is an error if f is undefined or is not in generation mode or if the buffer variable f" is undefined. Following Put f), f" is totally undefined. 

## Read(f,v) 

See User Manual, Chapters 9 and 12. and Report Sections 11.4 and 12.1. 

## Read(f,vl, ... ,vn) 

See User Manual, Chapters 9 and 12 and Report Sections 11.4 and 12.1. 

## Readln 

See User Manual, Chapters 9 and 12. and Report Section 12.2. 

## Readln(f,vl, ... ,vn) 

See User Manuaf, Chapters 9 and 12. and Report Section 12.2. 

## Reset (f) 

a file-handling procedure that places f in inspection mode and causes the posi­ tion of f to become the first position. If f is empty, eo f (f) becomes true and f" becomes totally undefined. Otherwise eo:: (f) becomes false and f" becomes the value of the first component of the sequence. 

## Rewrite (f) 

a file-handling procedure that replact; f with the empty sequence and places f in generation mode. Eo f ( f) becomes tI' Ie. 

## Round(r) 

a transfer function that computes t r1 'I c' (r + O. 5 ) for the real parameter r >= 0.0, or trunc (r - 0.5) for the real parameter r < 0.0, if such a value exists in the type Integer. Otherwise it I~ an error. 

## Sin(x) 

an arithmetic function that computes t i:lt~ real sine of a real or integer parameter x where x is in radians. 

