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How can I write an efficient number to string routine?

Frequently Asked Questions
Process the number starting from the end (i.e.

How do I convert a string to a number?

Updating the For Beginners forum FAQ - GameDev.Net Discussio...
I am including the header file <string>, and I am using the string class, but the code doesn't compile? (namespace resolution, having the std:: topics) How do I use unique() with vectors? (answered only once, but still a good question to have due to people not knowing that it's possible to do)

What is the most efficient way to count the number of bits which are set in a value?

Infrequently Asked Questions in comp.lang.c
Start a counter at zero and add one to it for each bit set. Some operating systems may provide a call to do this. For values over INT_MAX/2, start the counter at CHAR_BIT * sizeof(int) and subtract one for each bit not set.

How do I write my design for efficient hardware?

SystemCrafter - FAQ
You will need to think about what hardware is doing on each clock cycle. Decide where to process in parallel. You will need to use the minimum register size you can. If you have a number that is always between 0 and 7, store it in an sc_uint<3>, not an int. Use RAMs instead of arrays wherever possible. The benefit of SystemCrafter SC's design flow is that you can use the same test harness at all stages of the design.

How do I convert a std::string to a number?

Miscellaneous technical issues, C++ FAQ Lite
There are two easy ways to do this: you can use the <cstdio> facilities or the <iostream> library. In general, you should prefer the <iostream> library.

How can I write a function that takes a variable number of arguments?

Infrequently Asked Questions in comp.lang.c
By declaring it with a variable number of arguments in the prototype. Use only the arguments declared at any given time. Redefine printf; the call to ''printf'' inside yours will be resolved to the library version, because the C language doesn't allow recursion.

Why is radiant more efficient?

Radiantec : FAQ Frequently Asked Questions, Radiant Heat, Sy...
Cold air from infiltration falls. Cold air from conduction falls. Floor temperature falls in temperature by radiant loss to that of the average surface temperature. Your floors will be cold ( 50° F is not uncommon) unless you heat them no matter how well you insulate.

How can I write a cpp macro which takes a variable number of arguments?

Infrequently Asked Questions in comp.lang.c
Shouldn't the following code: #define ROSE 1 #define CHRYSANTHEMUM 2 #define RHODODENDRON 3 #define WATER_LILY 4 printf("%d\n", CHRYSATHNEMUM);

Is there any routine bloodwork that should be done?

Firehall 4 Animal Hospital : FAQ
We recommend running routine lab work on your pet if they are put on an anti-inflammatory to make sure that enzymatic activity in vital organs stay at appropriate levels. This should be done on a bi-annual basis. Every year, millions of unwanted dogs and cats, including puppies and kittens, are needlessly destroyed. The good news is that every pet owner can make a difference.

How can I count the number of occurrences of a substring within a string?

Found in /usr/local/lib/perl5/5.8.8/pod/perlfaq9.pod
There are a number of ways, with varying efficiency. If you want a count of a certain single character (X) within a string, you can use the "tr///" function like so: $string = "ThisXlineXhasXsomeXx'sXinXit"; $count = ($string =~ tr/X//); print "There are $count X characters in the string"; This is fine if you are just looking for a single character.

How do I split a string?

Frequently Asked Questions for comp.lang.lisp
There is no 'right' answer to this question; many lisp programmers have rolled their own solution in the past, and others are of the view that it should never be necessary, as long as all sequence functions are used with consistent :start and :end arguments. However, a community-based 'standard' was developed in June/July 2001 on comp.lang.lisp; known as SPLIT-SEQUENCE (formerly PARTITION), it works as follows in its simplest form: split-sequence #\Space "A stitch in time saves nine.

How can I write the most efficient code when using HBufC?

Descriptors FAQ
Spawn HBufC from existing descriptors using TDesC::AllocL() rather than creating and copying into them HBufC can be spawned from a existing descriptor using the Alloc() or AllocL() overloads of by TDesC. You can thus replace code like this: It is clearer and more efficient simply to dereference an HBufC if you need a non modifiable reference to its data. You only need to call Des() when you need to modify it - Des() will return a TPtr.

How efficient is it?

The Amalgam Collector - Protecting The Environment One Denta...
Following recommended settling times and decantation procedures allows for greater than 99.9% reduction of heavy metal pass through.

Why always the same routine?

FAQ - Bikram Yoga La Canada
The series was designed to work your entire body in every class. The postures complement each other, enhancing the progress in the practice and changes in the body. It takes about three classes for your body to begin to work with the postures. By practicing the same series, you are able to work deeper in the postures and ensure more benefits over time.

What to write?

Any Soldier Inc. Frequently Asked Questions - and maybe some...
Too easy: like you are talking to a friend, because that is what that Soldier is going to be to you real quick. It is also VERY helpful if you leave your full return address as part of your letter, envelopes tend to get trashed quickly.

How can find a string?

Exontrol Software - ExEdit FAQ page
The control provides Find and Replace support. The AllowFind property specifies whether the control can search for a string using the built-in Find dialog. By default, the AllowFind property is True. The control displays the Find dialog if the user presses CTRL+F key.

Why is Number Class arithmetic and comparison extremely efficient?

Base One Number Class - Frequently Asked Questions (FAQ)
Besides simply saving space, the compactness of Base One's Number Class representation provides a performance boost by shortening in-memory data transfers and reducing the amount of disk I/O. But there are additional reasons for significant speedups owing to the unique design of the Base/1 Number Class: all arithmetic calculations are performed taking two digits at a time Base One's algorithms for operations like addition, subtraction, multiplication, division, remainder, quotient, modulus, etc.

Where can I get an algorithm for an efficient random number generator?

Modula-2 FAQ
A1. Pierre L'Ecuyer: Efficient and Portable Combined Random Number Generators, Communications of the ACM, vol. 31, no. 6, pp. 742-749. The RNG has a period of approximately 2.3E+18. Generating 1 000 000 numbers per second, that means that it would take over 73 000 years before it repeated a sequence. A2.Look in the PMOS library. This one uses the 'Minimal standard random number generator' described by Park & Miller, CACM 31,10,Oct 88 p1192.

What is the most efficient way to count the number of bits which are set in an integer?

Miscellaneous
Many ''bit-fiddling'' problems like this one can be sped up and streamlined using lookup tables (but see question 20.13). Here is a little function which computes the number of bits in a value, 4 bits at a time: static int bitcounts[] = {0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4}; int bitcount(unsigned int u) { int n = 0; for(; u != 0; u >>= 4) n += bitcounts[u & 0x0f]; return n; }
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