Expression Evaluation Library

This is a library written in C# to allow the use of mathmatical expressions in an application.

Mathmatical Operators

• Addition

    1 + 2
    returns: 3
    
    1.1 + 2.2
    returns: 3.3
    
    a + 2
    a = 1
    returns: 3
  

• Subtraction

    2 - 1
    returns: 1
    
    2.2 - 1.1
    returns: 1.1
    
    a - 1
    a = 2
    returns: 1
  

• Multiplication

    2 * 3
    returns: 6
    
    2.2 * 3.3
    returns: 7.26
    
    a * 3
    a = 2
    returns: 6
  

• Division

    2 / 4
    returns: 0.5
    
    2 / 0.5
    returns: 4
    
    a * 3
    a = 2
    returns: 6
  

• Power

    2^2
    returns: 4
    
    2.1^2
    returns: 4.41
    
    a^2
    a = 2
    returns: 4
  

• Absolute

    abs(5)
    returns: 5
  
    abs(-5.5)
    returns: 5.5
  

• Negate

    neg(5)
    returns: -5
  
    neg(-5.5)
    returns: 5.5
  

• Natural Log

    ln(5)
    returns: 1.60943791
  

• Sign

    sign(5)
    returns: 1
  
    sign(0)
    returns: 1
  
    sign(-5.5)
    returns: -1
  

Logical Operators

• Or

    true || true
    returns: true
  
    true || false
    returns: true
  

• And

    true && true
    returns: true
  
    true && false
    returns: false
  

• Equal

    true == true
    returns: true
  
    1 == 2
    returns: false
  

• GreaterEqual

    1 >= 2
    returns: false
  
    2 >= 2
    returns: true
  

• LesserEqual

    1 <= 2
    returns: false
  
    2 <= 2
    returns: true
  

• GreaterThan

    2 > 1
    returns: true
  
    2 > 2
    returns: false
  

• LesserThan

    1 < 2
    returns: true
  
    2 < 2
    returns: false
  

• NotEqual

    1 != 2
    returns: true
  
    2 != 2
    returns: false
  

Date Time Operators

• Now

    now()
    returns: DateTime with current time and date
  

• Days

    days(5)
    returns: TimeSpan of 5 days
  

• Hours

    hours(5)
    returns: TimeSpan of 5 hours
  

• Minutes

    minutes(5)
    returns: TimeSpan of 5 minutes
  

• Seconds

    seconds(5)
    returns: TimeSpan of 5 hours
  

• TotalDays

    totaldays(timespan)
    timespan = 2 days
    returns: 2
  

• TotalHours

    totaldays(timespan)
    timespan = 2 days
    returns: 48
  

• TotalMinutes

    totaldays(timespan)
    timespan = 2 hours
    returns: 120
  

• TotalSeconds

    totaldays(timespan)
    timespan = 2 minutes
    returns: 120
  

• Addition

    timespan1 + timespan2
    timespan1 = 2 minutes
    timespan2 = 1 hour
    returns: TimeSpan of 62 minutes
  
    datetime1 + timespan1
    datetime1 = 2012-01-25 11:06:40
    timespan1 = 1 day
    returns: 2012-01-26 11:06:40
  

• Subtraction

    timespan1 - timespan2
    timespan1 = 1 hour
    timespan2 = 2 minutes
    returns: TimeSpan of 58 minutes
  
    datetime1 - timespan1
    datetime1 = 2012-01-25 11:06:40
    timespan1 = 1 day
    returns: 2012-01-24 11:06:40
  
    datetime1 - datetime2
    datetime1 = 2012-01-25 11:06:40
    datetime2 = 2012-01-24 11:06:40
    returns: timespan of 1 day
  

Precedance

Higher value wins. Ex: 2 + 3 * 4 = 2+(3*4) = 14. This can be overridden by the use of parenthesis and curley braces.

• 1
  • Or
• 2
  • And
• 3
  • Equal
  • GreaterEqual
  • LesserEqual
  • GreaterThan
  • LesserThan
  • NotEqual
• 4
  • Addition
  • Subtraction
• 5
  • Multiplication
  • Division
• 6
  • Power
• 7
  • Absolute
  • Negate
  • NaturalLog
  • Sign
  • Now
  • Days
  • Hours
  • Minutes
  • Seconds
  • TotalDays
  • TotalHours
  • TotalMinutes
  • TotalSeconds
• 8
  • if
  • elseif
  • else
• 9
  • (
  • )
  • {
  • }