Supported PB Features for PowerServer Mobile
PowerScript Topics

28-digit Decimal supports the following arithmetic operators:

Arithmetic operators: "+", "-", "*", "/"

Relational operators: =, >, <, <>, >=, <=

28-digit Decimal is supported in the following DataWindow expressions: Abs, Avg, CumulativeSum, Median, Sign, and Sum.

In the calculation, values/variables of Double or Real data type are handled as values/variables of Decimal data type.

Constants in an expression will be handled as Double datatype if the expression is being dynamically modified and contains relational operators (=, >, <, <>, >=, <=).

Constants in an expression will be handled as Decimal data type if the expression is being dynamically modified and contains arithmetic operators ("+", "-", "*", "/")

Appending the letter D in uppercase or lowercase to identify a number as a decimal constant in a DataWindow expression is unsupported in 28-digit decimal.

Decimal displaying in the DataWindow in Appeon may differ from that in PowerBuilder. Sometimes Decimal displays in scientific notation in PowerBuilder but displays in standard notation in Appeon.

If exceeding 28 digits, the decimal number cannot be correctly displayed on mobile.

Assigning strings to char arrays

Assigning char arrays to strings

When a string literal is assigned to a char variable, the first character of the string literal is assigned to the variable.

For example:

char c = "xyz" //results in the character x being 
          assigned to the char variable c.

Special characters (such as new line, form feed, octal, hex, etc.) can be assigned to char variables using string conversion.

For example:

char c = "~n"

A char variable assigned to a string variable results in a one-character string.

Expressions using both strings and char arrays promote the chars to strings before evaluation.

For example:

char c if (c = "x") then // promotes the contents 
          of c to a string before comparison with the string "x"

Using chars in PowerScript functions. All PowerScript functions that take strings also take chars, subject to the above described conversion rules.

The order of precedence in PowerBuilder regarding numeric data types is supported. The following is the order of precedence from highest to lowest (based on the range of values for each data type):

(High) Double >> Real >> Decimal >> UnsignedLong >> Long >> UnsignedInteger >> Integer (Low)

If operands in an expression have different data types, the value whose type has lower precedence is converted to the data type with higher precedence.

For example:

int x; x=2.4
PowerScript result: the value of x is actually 2, 
because x is defined as an integer. 
PowerBuilder will cut the digit after the decimal point, then assign 2 to x.

Unsigned type has precedence over signed. So if one operand is signed and the other is unsigned, both are promoted to the unsigned version of the higher type. For example, if one operator is a Long and another an UnsignedInteger, both are promoted to UnsignedLong.

Transform other numeric data types recessive to integer or int data. A force conversion from other numeric data to int/long data will arrive at the same value in PowerScript and JavaScript.