Object Pascal Language Guide by Borl, Delphi

By Borl, Delphi

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Succ ordinal expression successor of expression’s value Do not use on properties that have a write procedure. High ordinal type identifier or variable of ordinal type highest value in type Also operates on short-string types and arrays. Low ordinal type identifier or variable of ordinal type lowest value in type Also operates on short-string types and arrays. For example, High(Byte) returns 255 because the highest value of type Byte is 255, and Succ(2) returns 3 because 3 is the successor of 2.

The value of x div y is the value of x/y rounded in the direction of zero to the nearest integer. • The mod operator returns the remainder obtained by dividing its operands. In other words, x mod y = x – (x div y) * y. • A runtime error occurs when y is zero in an expression of the form x/y, x div y, or x mod y. Boolean operators The Boolean operators not, and, or, and xor take operands of any Boolean type and return a value of type Boolean. 5 Boolean operators Operator Operation Operand types Result type Example not negation Boolean Boolean not (C in MySet) and conjunction Boolean Boolean Done and (Total > 0) or disjunction Boolean Boolean A or B xor exclusive disjunction Boolean Boolean A xor B These operations are governed by standard rules of Boolean logic.

The use of multiple units further complicates the definition of scope. Each unit listed in a uses clause imposes a new scope that encloses the remaining units used and the program or unit containing the uses clause. The first unit in a uses clause represents the outermost scope and each succeeding unit represents a new scope inside the previous one. If two or more units declare the same identifier in their interface sections, an unqualified reference to the identifier selects the declaration in the innermost scope—that is, in the unit where the reference itself occurs, or, if that unit doesn’t declare the identifier, in the last unit in the uses clause that does declare the identifier.

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