Shortint

The predefined data type shortint is an integer in the range -32768..32767 that is stored in 16 bits. (In contrast, if you declare a variable to be in that range, it is stored in 32 bits.) The type shortint has the following uses:

If you want to access an external non-Pascal routine that has a formal parameter of a type whose range is -32768..32767, and uses 16-bits of storage, you can declare a corresponding formal Pascal parameter of type shortint, and it will be compatible.
For Pascal/V compatibility.

To determine whether a type T is assignment compatible with the type shortint, you can treat shortint as a subrange of integer. This means that you can assign a variable v of type T to a variable sv of type shortint if:

The type T is integer or a subrange of integer.
The value of v is within the range of shortint (-32768..32767).
If the ranges of T and shortint do not overlap, the assignment sv:=v causes a compile-time error. If the ranges of T and shortint do overlap, but the value of v is outside the range of shortint the assignment sv:=v causes a run-time error.

Example

PROGRAM prog;
 
TYPE
   T1 = integer;       {overlaps shortint range}
   T2 = -10..40000;    {overlaps shortint range}
   T3 = 40000..50000;  {does not overlap shortint range}
 
VAR
   v1 : T1;            {sv:=v1 may be legal, depending on value of v1}
   v2 : T2;            {sv:=v2 may be legal, depending on value of v2}
   v3 : T3;            {sv:=v3 is never legal}
   sv : shortint;
 
BEGIN
   v1 := 10;
   sv := v1;      {legal assignment}
 
   v1 := 45000;
   sv := v1;      {causes run-time error}
 
   v2 := 400;
   sv := v2;      {legal assignment}
 
   v2 := 35000;
   sv := v2;      {causes run-time error}
 
   v3 := 40000;
   sv := v3;      {causes compile-time error}
END.

Shortint

Technical documentation

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