C++ Job interview question: Old school bsearch and qsort source code example from the world of C

(Last Updated On: May 18, 2010)
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C++ Job interview question: Old school bsearch and qsort source code example from the world of C.

This may give you a better understanding of trees are you move into C++.

Here are some traditional binary and quick sort source code example

/* bsearch example */
#include
#include

int compareints (const void * a, const void * b)
{
return ( *(int*)a – *(int*)b );
}

int values[] = { 10, 20, 25, 40, 90, 100 };

int main ()
{
int * pItem;
int key = 40;
pItem = (int*) bsearch (&key, values, 6, sizeof (int), compareints);
if (pItem!=NULL)
printf (“%d is in the array.\n”,*pItem);
else
printf (“%d is not in the array.\n”,key);
return 0;
}

/* qsort example */
#include
#include

int values[] = { 40, 10, 100, 90, 20, 25 };

int compare (const void * a, const void * b)
{
return ( *(int*)a – *(int*)b );
}

int main ()
{
int n;
qsort (values, 6, sizeof(int), compare);
for (n=0; n<6; n++) printf ("%d ",values[n]); return 0; }

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Hi i there My name is Bryan Downing. I am part of a company called QuantLabs.Net This is specifically a company with a high profile blog about technology, trading, financial, investment, quant, etc. It posts things on how to do job interviews with large companies like Morgan Stanley, Bloomberg, Citibank, and IBM. It also posts different unique tips and tricks on Java, C++, or C programming. It posts about different techniques in learning about Matlab and building models or strategies. There is a lot here if you are into venturing into the financial world like quant or technical analysis. It also discusses the future generation of trading and programming Specialties: C++, Java, C#, Matlab, quant, models, strategies, technical analysis, linux, windows P.S. I have been known to be the worst typist. Do not be offended by it as I like to bang stuff out and put priorty of what I do over typing. Maybe one day I can get a full time copy editor to help out. Do note I prefer videos as they are much easier to produce so check out my many video at youtube.com/quantlabs