Download Write Great Code, Volume 1: Understanding the Machine by Randall Hyde PDF

By Randall Hyde

If you've requested an individual the key to writing effective, well-written software program, the reply that you've most likely gotten is "learn meeting language programming." by way of studying meeting language programming, you learn the way the computer rather operates and that wisdom might help you write greater high-level language code. a grimy little mystery meeting language programmers hardly ever admit to, notwithstanding, is that what you actually need to profit is desktop association, now not meeting language programming. Write nice Code Vol I, the 1st in a chain from meeting language specialist Randall Hyde, dives correct into computer association with out the additional overhead of studying meeting language programming even as. and because Write nice Code Vol I concentrates at the computer association, no longer meeting language, the reader will research in higher intensity these topics which are language-independent and of outrage to a excessive point language programmer. Write nice Code Vol i'm going to support programmers make wiser offerings with admire to programming statements and knowledge varieties whilst writing software program, regardless of which language they use.

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If the 16-bit signed value is greater than +127, then you clip the value to +127 and store +127 into the 8-bit object. Likewise, if the value is less than −128, you clip the final 8-bit object to −128. Saturation works the same 4 Borland’s compilers require the use of a special compiler directive to activate this check. By default, the compiler does not do the bounds check. info way when clipping 32-bit values to smaller values. If the larger value is outside the range of the smaller value, then you simply clip the value to the closest value that you can represent with the smaller data type.

For example, the Intel 80x86 floating-point unit (FPU) supports a pair of instructions for loading and storing BCD values. Internally, however, the FPU converts these BCD values to binary. It only uses BCD as an external data format (external to the FPU, that is). This generally produces more accurate results. 10 Fixed-Point Representation One thing you may have noticed by now is that this discussion has dealt mainly with integer values. A reasonable question to ask is how one represents fractional values.

If the quotient is not zero and the number is even, prefix your binary string with zero. Go back to step 2 and repeat. 3. 4. 5. 2 Making Binary Numbers Easier to Read As you can tell by the equivalent representations, 20210 and 110010102, binary representation is not as compact as decimal representation. Because binary representation is bulky, we need some way to make the digits, or bits, in binary numbers easier to read. In the United States, most people separate every three digits with a comma to make larger numbers easier to read.

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