Category: C++

Jan 02

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 …

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Jan 02

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  */            Note: Brought from our …

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Jan 02

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 …

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Jan 02

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 …

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Jan 02

valarray slice

/* 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 …

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Jan 02

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 …

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Jan 02

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 …

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Jan 02

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 …

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Jan 02

A Simple C++ Program

#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] = ”; // null terminate str cout << num << ‘ ‘ << str; in.close(); return 0; } …

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Jan 02

Read file content

#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] = ”; // null terminate str cout << num << ‘ ‘ << str; in.close(); return 0; } …

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