/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
Category: C++
Jul 30
Use sorting criterion in sort function
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
Jul 29
Sort objects stored in deque
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
Jul 29
A simple C++ Program code
#include <iostream> #include <fstream> using namespace std; int main() { ifstream in(“test”, ios::in | ios::binary); if(!in) { cout << “Cannot open input file.\n”; return 1; } double num; char str[80]; in.read((char *) &num, sizeof(double)); in.read(str, 14); str[14] = ‘\0’; // null terminate str cout …
Jul 29
valarray with double value inside
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
Jul 27
Print minimum, maximum, and sum of the valarray
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
Jul 27
Call member function for each element in vector
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in …
Jul 27
Use bitset with enum together
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided “as is” without express or implied * warranty, and with no claim as to its suitability for any purpose. */ #include <bitset> #include <iostream> using namespace std; int main() { /* enumeration type for the bits * – each bit represents a color */ enum Color { red, yellow, green, blue, white, black, //…, numColors }; // create bitset for all bits/colors bitset<numColors> usedColors; // set bits for two colors usedColors.set(red); usedColors.set(blue); // print some bitset data cout << “bitfield of used colors: ” << usedColors << endl; cout << “number of used colors: ” << usedColors.count() << endl; cout << “bitfield of unused colors: ” << ~usedColors << endl; // if any color is used if (usedColors.any()) { // loop over all colors for (int c = 0; c < numColors; ++c) { // if the actual color is used if (usedColors[(Color)c]) { //… } } } } /* bitfield of used colors: 001001 number of used colors: 2 bitfield of unused colors: 110110 */
Jul 27
Transform binary representation into integral number using bitset
/* The following code example is taken from the book * “The C++ Standard Library – A Tutorial and Reference” * by Nicolai M. Josuttis, Addison-Wesley, 1999 * * (C) Copyright Nicolai M. Josuttis 1999. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided “as is” without express or implied * warranty, and with no claim as to its suitability for any purpose. */ #include <bitset> #include <iostream> #include <string> #include <limits> using namespace std; int main() { /* print some numbers in binary representation */ cout << “267 as binary short: ” << bitset<numeric_limits<unsigned short>::digits>(267) << endl; cout << “267 as binary long: ” << bitset<numeric_limits<unsigned long>::digits>(267) << endl; cout << “10,000,000 with 24 bits: ” << bitset<24>(1e7) << endl; /* transform binary representation into integral number */ cout << “\”1000101011\” as number: ” << bitset<100>(string(“1000101011″)).to_ulong() << endl; } /* 267 as binary short: 0000000100001011 267 as binary long: 00000000000000000000000100001011 10,000,000 with 24 bits: 100110001001011010000000 1000101011” as number: 555 */ // create a bitset that is 8 bits long bitset<8> bs; // display that bitset for( …