2 inputlevel - current input level
8 return nonnegative integer
11 This function returns the input level at which it is called.
12 When calc starts, it is at level zero. The level is increased
13 by 1 each time execution starts of a read file command or a call to
14 eval(S) for some expression S which evaluates to a string. It
15 decreases by 1 when a file being read reaches EOF or a string
16 being eval-ed reaches '\0', or earlier if a quit statement is
17 encountered at top calculation-level in the flle or string. It
18 decreases to zero if an abort statement is encountered at any
19 function-level in the file or string. If a quit or abort
20 statement is encountered at top calculation-level at top input-level,
23 Zero input level is also called top input level; greater values
24 of inputlevel() indicate reading at greater depths.
36 read, eval, quit, abort, calclevel