Many sources, including Microsoft, reference both the int and long type as being 4 bytes and having a range of (signed) -2,147,483,648 to 2,147,483,647. What is the point of having a long primitive type if it doesn't actually provide a larger range of values?
C++ – Why Are int and long Types Both 4 Bytes?
c++cpu-architecture
Best Answer
The only things guaranteed about integer types are:
sizeof(char) == 1
sizeof(char) <= sizeof(short)
sizeof(short) <= sizeof(int)
sizeof(int) <= sizeof(long)
sizeof(long) <= sizeof(long long)
sizeof(char) * CHAR_BIT >= 8
sizeof(short) * CHAR_BIT >= 16
sizeof(int) * CHAR_BIT >= 16
sizeof(long) * CHAR_BIT >= 32
sizeof(long long) * CHAR_BIT >= 64
The other things are implementation defined. Thanks to (4), both
long
andint
can have the same size, but it must be at least 32 bits (thanks to (9)).