How to do unsigned integer/64 bit ops?

WSinc — Thu, 21 Jun 2001 00:40:27 GMT

When dealing with other platforms where some of the data (telemetry for example) is unsigned integers, is there a way to treat such quantities accordingly in the compiler? I could not find the equivalent of the UNSIGNED key word, like in C++.

Also, how can I do a 32 bit by 32 bit unsigned multiply to get a 64 bit unsigned result? I would eventually like to develop a long number package when I can do operations with very long integers, as for example encryption algorithms.

Example: C=A*B where A and B are 512 bits each, but also to be able to take a MODULO, do long division, etc.

Re: How to do unsigned integer/64 bit ops?

Steven_L_Intel1 — Thu, 21 Jun 2001 03:31:07 GMT

Fortran doesn't have the concept of "unsigned".

There's an existing quadruple-precision arithmetic package, pointed to from our Companion Products page.

The next version, free to 6.5 users, will support INTEGER*8 (and LOGICAL*8). Look for it in August.

Steve

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How to do unsigned integer/64 bit ops?

Re: How to do unsigned integer/64 bit ops?