Calculations

Tap Forms has a special field type called Calculation.

For basic math, use the following operators:

Operator	Symbol
Add	+
Subtract	-
Multiply	*
Divide	/

The following mathematical expressions in the Calculation field formula editor are supported:

Single parameter functions:

SQR: Square function which can be used as SQR(X)
SIN: Sinus function which can be used as SIN(X), X is a real-type expression. Sin returns the sine of the angle X in radians.
COS: Cosinus function which can be used as COS(X), X is a real-type expression. COS returns the cosine of the angle X in radians.
ATAN: ArcTangent function which can be used as ATAN(X)
SINH: Sinus Hyperbolic function which can be used as SINH(X)
COSH: Cosinus Hyperbolic function which can be used as COSH(X)
COTAN: which can be used as COTAN(X)
TAN: which can be used as TAN(X)
EXP: which can be used as EXP(X)
LN: natural log, which can be used as LN(X)
LOG: 10 based log, which can be used as LOG(X)
SQRT: which can be used as SQRT(X)
ABS: absolute value, which can be used as ABS(X)
SIGN: SIGN(X) returns -1 if X<0; +1 if X>0, 0 if X=0; it can be used as SQR(X)
TRUNC: Discards the fractional part of a number. e.g. TRUNC(-3.2) is -3, TRUNC(3.2) is 3.
CEIL: CEIL(-3.2) = 3, CEIL(3.2) = 4
FLOOR: FLOOR(-3.2) = -4, FLOOR(3.2) = 3

Two parameter functions:

INTPOW: The INTPOW function raises Base to an integral power. INTPOW(2, 3) = 8. Note that result of INTPOW(2, 3.4) = 8 as well.
POW: The Power function raises Base to any power. For fractional exponents or exponents greater than MaxInt, Base must be greater than 0.
LOGN: The LogN function returns the log base N of X. Example: LOGN(10, 100) = 2
MIN: MIN(2, 3) is 2.
MAX: MAX(2, 3) is 3.
IF: The IF(b, case1, case2) function provides branching capability. If b is not 0, then it returns case1, else it returns case2. Behavior is similar to C#’s: return b ? case1 : case2;
If b==0 then case1 will not be evaluated, and vice versa. Example: IF(HEIGHT, 3/HEIGHT, 3) will make sure 3/HEIGHT does not cause division by zero.

No parameter functions:

RND: RND() function generates a random number (double value) between 0 and 1.

Multiple parameter functions:

SUM: SUM(2,3,5,…) functions returns the sum of it’s arguments. There is no preset limit on the number of parameters.

Text Concatenation

In addition to the above mathematical expressions, Tap Forms also supports text concatenation. With this feature, you can create Calculation fields which return a Text value instead of a Number value.

For example, you could create a Calculation field called Full Name (or whatever you want to call it) which has the following formula:

First Name + “ “ + Last Name

As long as you set the Result Type property on the Formula Editor to Text, then Tap Forms will evaluate the above formula and return the string with the First Name and Last Name fields joined together with a space character in between. It’s especially useful for creating labels. You can keep your First Name and Last Name fields as separate fields, but for printing labels, you would want them to be joined together into a Full Name field to make your labels look nicer.

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