How to Count (Programming for Mere Mortals Book 1)

By Steven Frank

"Programming for Mere Mortals" is a sequence of books designed to introduce the recommendations of programming from the floor as much as a reader who hasn't ever written a line of code.

Unlike such a lot programming books which target to educate you a specific language or working process, this sequence specializes in the center basics which are universal to programming any computer.

In a laid-back, conversational tone, "How to count number" introduces you to math issues which are necessary to changing into a winning programmer, including:

- Numeric bases (decimal, binary, hexadecimal)
- Signed vs. unsigned numbers
- Floating element and stuck aspect arithmetic

This brief, simply understood ebook will fast get you considering like a programmer.

Steven Frank has been a certified programmer considering the fact that 1994, and co-founded the well known Mac software program corporation Panic, Inc.

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In that feel, you could contemplate the net like a bookshelf simply above your succeed in. To get whatever off the web “bookshelf”, you might want to take it “down” and vice-versa. web services optimize their networks to supply larger downward speeds on the cost of upward speeds. It’s in general a lot, a lot swifter to obtain than to add anything on a client web connection simply because, as a rule, downloading is what shoppers are looking to do with their web connection. Our hypothetical supplier deals 6 Mbps down. Sounds lovely strong! yet let’s math it out. First, we’ll determine what 6 Mbps is in bps: 6 megabits-per-second = 6 × 1,024 Kbps = 6,144 Kbps 6,144 Kbps = 6,144 × 1,024 bps = 6,291,456 bps In our smooth desktops, there are eight bits in a byte: 6,291,456 bps ÷ eight bits-per-byte = 786,432 bytes-per-second (Bps) …and 1,024 bytes in a kilobyte: 786,432 Bps ÷ 1,024 bytes-per-kilobyte = 768 kilobytes-per-second (kBps) So, our 6 Mbps connection really corresponds to 768 kB (less than a megabyte) transferred according to moment. without notice, it doesn’t sound really so remarkable. probably that’s why they nonetheless use bits-per-second notation. Floating element once more I’ve been hiding a specific subject from you, yet you recognize adequate now with the intention to deal with it! each quantity we’ve observed to this point has been an “integer”. They’ve all been complete numbers like 1, 2, or three. by no means fractions like ½ or 2. seventy eight. absolutely a working laptop or computer needs to be in a position to care for fractions? certainly they do. on the hazard of sounding like a damaged checklist, i'll remind you back that the single factor a working laptop or computer is familiar with is bits. So, what’s wanted is a fashion of representing a fractional quantity through the use of a specific bit trend. One approach to doing this can be referred to as “floating point”. That’s a humorous identify. What does it suggest? It refers back to the indisputable fact that the decimal aspect can “float” round within the quantity. it may flow over to the left: 1. 743485 Or over to the correct: 174348. five Or someplace in-between: 1743. 485 crucial factor you want to find out about floating aspect math is that, not like integer math, it really is vague. Any computing device should be capable of upload the integers 1 + 1 and continuously get a hold of 2. yet what approximately zero. 152321 + 912. 772? It’s a simple adequate challenge to unravel on paper, so it may be no gigantic deal for a working laptop or computer, correct? not like people, desktops can not calculate fractional numbers to an unlimited precision. they are often programmed to have a truly excessive measure of precision, but when you retain including numbers after the decimal element, eventually, a few rounding needs to take place, so that it will bring about a lack of accuracy. now and then, a newspaper article will pop up a couple of foolish computing device application that went awry since it, say, divided 1 via 2, and rather than getting zero. five, got here up with zero. 4999999999 and that during flip threw off a few severe calculation elsewhere down the road and, lengthy tale brief, the rocket went off into deep house rather than touchdown at the moon. Why could that take place?

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