Tap Forms has a special field type called Calculation.
For basic math, use the following operators:
The following mathematical expressions in the Calculation field formula editor are supported:
Single parameter functions:
SQR: Square function which can be used as
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
SINH: Sinus Hyperbolic function which can be used as
COSH: Cosinus Hyperbolic function which can be used as
COTAN: which can be used as
TAN: which can be used as
EXP: which can be used as
LN: natural log, which can be used as
LOG: 10 based log, which can be used as
SQRT: which can be used as
ABS: absolute value, which can be used as
SIGN(X) returns -1 if X<0; +1 if X>0, 0 if X=0; it can be used as
TRUNC: Discards the fractional part of a number. e.g.
TRUNC(-3.2) is -3,
TRUNC(3.2) is 3.
CEIL(-3.2) = 3,
CEIL(3.2) = 4
FLOOR(-3.2) = -4,
FLOOR(3.2) = 3
Two parameter functions:
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 function returns the log base N of X. Example:
LOGN(10, 100) = 2
MIN(2, 3) is 2.
MAX(2, 3) is 3.
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;
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() function generates a random number
(double value) between 0 and 1.
Multiple parameter functions:
SUM(2,3,5,…) functions returns the sum of it’s arguments. There is no preset limit on the number of parameters.
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 + “ “ +
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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