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Add Integers Symbolically Function
Math Symbolic Class

Public Function AddIntegersSymbolically( _
      ByVal vNumOne As Variant _
    , ByVal vNumTwo As Variant _
    ) As Variant

"Add Two Positive Integers Symbolically"
Both numbers are passed via strings which have no arbitrary length limits.

Examples: 
    ? AddIntegersSymbolically("123", "4567")
    4690
    ? AddIntegersSymbolically(123, "4567")
    4690
    ? AddIntegersSymbolically("12345678901234567890", "987654321987654321")
    13333333223222222211
    ? AddIntegersSymbolically("9238923892389238923898239823", "238978238728378232378238")
    9239162870627967302130618061
    ? AddIntegersSymbolically(Null, "2839839")
    Null
See also: 
    MultiplyIntegersSymbolically Function
    Addit Function
vNumOne: First of two base-10 numeric strings which will be added symbolically. Function returns Null if vNumOne is Null or cannot be fixed up to a String. This string should represent an positive integer (it must have no sign nor floating-point portion); it should contain only the characters 0..9.

vNumTwo: Second of two base-10 numeric strings which will be added symbolically. Function returns Null if vNumTwo is Null or cannot be fixed up to a String. Likewise, this string should represent an positive integer (it must have no sign nor floating-point portion); it should contain only the characters 0..9.

Note: This function does not ensure that the arguments vNumOne and vNumTwo contain only numeric digits (the characters from "0" through "9"). Its result is meaningless in such cases, and the result of this function in such cases is undefined.
Return value: Function returns the sum in the form of a numeric string.

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