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Microsoft® JScript
- Operator

See Also

Language Reference |

Used to find the difference between two numbers or to indicate the negative value of a numeric expression.

Syntax 1

result = number1 - number2

Syntax 2


The - operator syntax has these parts:

Part Description
result Any numeric variable.
number Any numeric expression.
number1 Any numeric expression.
number2 Any numeric expression.


In Syntax 1, the - operator is the arithmetic subtraction operator used to find the difference between two numbers. In Syntax 2, the - operator is used as the unary negation operator to indicate the negative value of an expression.

For information on when a run-time error is generated by Syntax 1, please see the Arithmetic Operators table.

For Syntax 2, as for all unary operators, expressions are evaluated as follows:

  • If applied to undefined or null expressions, a run-time error is raised.
  • Objects are converted to strings.
  • Strings are converted to numbers if possible. If not, a run-time error is raised.
  • Booleans are treated as numbers (0 if false, 1 if true).
  • The operator is applied to the resulting number.
In Syntax 2, if the resulting number is nonzero, result will be equal to the resulting number with its sign reversed. If the resulting number is zero, result is zero.

© 1996 by Microsoft Corporation.

See also:

file: /Techref/language/asp/js/184.htm, 3KB, , updated: 1996/11/22 10:11, local time: 2019/12/12 06:06,

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