Home Online Manual
Top
Back: type
Forward: univariate
FastBack: Functions and system variables
FastForward: Control structures
Up: Functions
Top: Singular Manual
Contents: Table of Contents
Index: Index
About: About this document

5.1.159 typeof

Syntax:
typeof ( expression )
Type:
string
Purpose:
returns the type of an expression as string.

Returns the type of the first list element if the expression is an expression list.

Possible types are: "ideal", "int", "intmat", "intvec", "list", "map", "matrix", "module", "number", "none", "poly", "proc", "qring", "resolution", "ring", "string", "vector".

For internal use only is the type "?unknown type?".

Example:
 
  int i=9; i;
==> 9
  typeof(_);
==> int
  print(i);
==> 9
  typeof(_);
==> string
  type i;
==> // i int 9
  typeof(_);
==> string
  string s=typeof(i);
  s;
==> int
  typeof(s);
==> string
  proc p() {  "hello"; return();}
  p();
==> hello
  typeof(_);
==> ?unknown type?
See Data types; type.