67 lines
2.1 KiB
Plaintext
67 lines
2.1 KiB
Plaintext
The following table shows correspondences between C/C++ and Pascal numerical types.
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References are:
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- FPC Reference guide (v1.0.8).
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- The C Library Reference Guide, by Eric Huss.
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- BeAPI headers.
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C/C++ <-> BeAPI <-> Pascal
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==========================
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signed char = int8 = Shortint;
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unsigned char = unit8 = Byte;
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short int = int16 = Smallint;
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unsigned int = unit16 = Word;
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int = = We use Integer most times for this, but could be Smallint
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long = int32 = Longint;
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unsigned long = uint32 = Longword;
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long long = int64 = Int64;
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unsigned long long = uint64 = QWord;
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float = = Single;
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double = = Double;
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long double = = Extended;
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C/C++ Types
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===========
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Type | Size | Range
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---------------------------------
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unsigned char | 8 bits | 0 to 255
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char | 8 bits | -128 to 127
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unsigned int | 16 bits | 0 to 65,535
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short int | 16 bits | -32,768 to 32,767
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int | 16 bits | -32,768 to 32,767
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unsigned long | 32 bits | 0 to 4,294,967,295
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long | 32 bits | -2,147,483,648 to 2,147,483,647
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float | 32 bits | 1.17549435 * (10^-38) to 3.40282347 * (10^+38)
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double | 64 bits | 2.2250738585072014 * (10^-308) to 1.7976931348623157 * (10^+308)
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long double | 80 bits | 3.4 * (10^-4932) to 1.1 * (10^4932)
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FPC Pascal Types
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================
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Type | Size | Range
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---------------------------
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Byte | 8 bits | 0..255
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ShortInt | 8 bits | -128..127
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Word | 16 bits | 0..65535
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SmallInt | 16 bits | -32768..32767
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LongWord | 32 bits | 0..4294967295
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LongInt | 32 bits | -2147483648..2147483647
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//[*]These two depends on the compiler mode and platform.
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Integer | 16 32 64 | either smallint, longint or int64
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Cardinal | 16 32 64 | either word, longword or qword
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Real | 16/32 | (depends on the platform)
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Single | 32 bits | 1.5E-45 .. 3.4E38
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Double | 64 bits | 5.0E-324 .. 1.7E308
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Extended | 80 bits | 1.9E-4951 .. 1.1E4932
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Int64 | 64 bits | -9223372036854775808 .. 9223372036854775807
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QWord | 64 bits | 0 .. 18446744073709551615
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Comp | 64 bits | -2E64+1 .. 2E63-1
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