====== "eval" command ======

===== Purpose =====

Check and evaluate an expression.

===== Syntax =====

  eval expression

===== Comments =====

The eval command evaluates an expression and prints the result as a number.

===== Examples =====

  gnucap> param a={b+c+7}
  gnucap> eval a
  parameter b+c+7 has no value
  parameter b+c+7 has no value
  a= NA
  gnucap> param b=c+3
  gnucap> param c=4
  gnucap> eval a
  a= 18.
  gnucap> eval b+c
  (b + c)= 11.
  gnucap>