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:
ABS: absolute value, which can be used as
ATAN: ArcTangent function which can be used as
CEIL(-3.2) = 3,
CEIL(3.2) = 4
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.
COSH: Cosinus Hyperbolic function which can be used as
COTAN: which can be used as
EXP: which can be used as
FLOOR(-3.2) = -4,
FLOOR(3.2) = 3
LN: natural log, which can be used as
LOG: 10 based log, which can be used as
NOW: inserts the current time in seconds since January 1, 1970 00:00:00 GMT
SIGN(X) returns -1 if X<0; +1 if X>0, 0 if X=0; it 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.
SINH: Sinus Hyperbolic function which can be used as
SQR: Square function which can be used as
SQRT: which can be used as
TAN: which can be used as
TRUNC: Discards the fractional part of a number. e.g.
TRUNC(-3.2) is -3,
TRUNC(3.2) is 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.
DATE([Field], "yyyy-MM-dd") function formats a date in a human readable way. Please see the Unicode Technical Standard #35 for pattern syntax and examples.
FORMAT([Field], "#.00") function formats a number in a variety of ways and returns a text representation of the number. Please see the Unicode Technical Standard #35 for pattern syntax and examples.
Three parameter functions:
IF(b, case1, case2) function provides branching capability. If b is not 0, then it returns case1, else it returns case2. Example:
IF(HEIGHT, 3/HEIGHT, 3) will make sure 3/HEIGHT does not cause a division by zero error.
IFEMPTY([Field], case1, case2) function also provides branching capability. If [Field] is empty, then it returns case1, else it returns case2.
IFNOTEMPTY([Field], case1, case2) function also provides branching capability. If [Field] is NOT empty, then it returns case1, else it returns case2.
No parameter functions:
NOW() inserts the current date and time in seconds into the formula.
TODAY() inserts the current date in seconds into the formula. The time is 00:00:00.
RND() function generates a random number
(double value) between 0 and 1.
Multiple parameter functions:
AVG(2, 5, 3,...) returns the average of all the parameters. e.g. AVG is 3.5.
SUM(2,3,5,…) functions returns the sum of it’s arguments. There is no preset limit on the number of parameters.
CONCAT("A", "B", "C",...) joins values together. It’s an alternative to the
+ function for 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 + “ “ +
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.
An example of joining the parts of a mailing address so it avoids blank lines if certain fields are empty:
First Name + “ “ +
Last Name + “\r” +
Company + “\r”, “” ) +
Address 1 + “\r” +
Address 2 + “\r”, “” ) +
City + “, “ +
Province + “ “ +
In the above example, the IFNOTEMPTY (
Company + “\r”, “” ) part checks to see if the
Company field is not empty. If it has a value, it returns the value in the
Company field and adds a linefeed character to it. If it has no value, it simply returns nothing (an empty string).
"\r" part inserts a new line into the result.
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