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javac++long-integerprimitive-types
Martijn Courteaux
Martijn Courteaux

Reputation: 68877

C++ variant for Java long?

Is there a C++ variant for the long primitive data-type?
A C++ long is only 4 bytes, while a Java long is 8 bytes.

So: Is there a non-decimal primitive type with a size of 8 bytes in C++?
Maybe with some tricks?

Thanks

Upvotes: 2

Views: 6451

Answers (3)

user3162424
user3162424

Reputation:

Since C++11, there are fixed width integer types in the <cstdint> header. In your scenario, you would want to use std::int64_t or std::uint64_t.

Because it is part of the C++11 language specification, platform and compiler compatibility should be guaranteed.

Upvotes: 2

Michael Borgwardt
Michael Borgwardt

Reputation: 346357

Microsoft Visual C++ defines an __int64 type that's equivalent to Java's long. gcc has int64_t. There's even a long long int type defined in the ISO C99 standard, however according to the standard it's at least 64 bits wide, but could be wider.

But apart from the size, there's also endianness to consider. The Java standard mandates big endian, but with C, endianness is AFAIK always platform-dependant.

Upvotes: 4

Scharrels
Scharrels

Reputation: 3055

C++ has a long long type, with a length of 64 bits (on most platforms).

Upvotes: 3

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