Namensräume
Varianten
Aktionen

std::qsort

Aus cppreference.com
< cpp‎ | algorithm

This page has been machine-translated from the English version of the wiki using Google Translate.

The translation may contain errors and awkward wording. Hover over text to see the original version. You can help to fix errors and improve the translation. For instructions click here.

Click here for the English version of this page

 
C++
 
Algorithm Bibliothek
Funktionen
Original:
Functions
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Nicht-modifizierende Sequenz Operationen
Original:
Non-modifying sequence operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Modifizierende Sequenz Operationen
Original:
Modifying sequence operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Partitionierungsoperationen
Original:
Partitioning operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Sortierung Operationen (auf sortierten Bereiche)
Original:
Sorting operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Binary Suchaktionen (auf sortierten Bereiche)
Original:
Binary search operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Set-Operationen (auf sortierten Bereiche)
Original:
Set operations (on sorted ranges)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Heap-Operationen
Original:
Heap operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Minimum / Maximum Operationen
Original:
Minimum/maximum operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
Numerische Operationen
Original:
Numeric operations
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
C-Bibliothek
Original:
C library
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
qsort
 
definiert in Header <cstdlib>
void qsort( const void *ptr, size_t count, size_t size,
            int (*comp)(const void *, const void *) );
Sortiert die angegebene Array, auf das ptr in aufsteigender Reihenfolge. Das Array enthält count Elemente der Größe size. Funktion, auf die comp ist für Objekt Vergleich herangezogen .
Original:
Sorts the given array pointed to by ptr in ascending order. The array contains count elements of size size. Function pointed to by comp is used for object comparison.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

Inhaltsverzeichnis

[Bearbeiten] Parameter

ptr -
Zeiger auf das Array zu sortieren
Original:
pointer to the array to sort
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
count -
Zahl der Element in dem Array
Original:
number of element in the array
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
size -
Größe der einzelnen Elemente in dem Array in Bytes
Original:
size of each element in the array in bytes
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.
comp - comparison function which returns ​a negative integer value if the first argument is less than the second,

a positive integer value if the first argument is greater than the second and zero if the arguments are equal.
The signature of the comparison function should be equivalent to the following:

 int cmp(const void *a, const void *b);

The function must not modify the objects passed to it.

​

[Bearbeiten] Rückgabewert

(None)
Original:
(none)
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[Bearbeiten] Notes

Der Typ der Elemente des Arrays muss ein trivial Typ sein, da sonst das Verhalten undefiniert ist .
Original:
The type of the elements of the array must be a trivial type, otherwise the behavior is undefined.
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

[Bearbeiten] Beispiel

Der folgende Code sortiert ein Array von Ganzzahlen mit qsort() .
Original:
The following code sorts an array of integers using qsort().
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

#include <iostream>
#include <cstdlib>
 
int compare_ints(const void* a, const void* b)   // comparison function
{
    int* arg1 = (int*) a;
    int* arg2 = (int*) b;
    if (*arg1 < *arg2) return -1;
    else if (*arg1 == *arg2) return 0;
    else return 1;
}
 
int main()
{
    int a[] = { -2, 99, 0, -743, 2, 3, 4 };
    int size = 7;
 
    std::qsort(a, size, sizeof(int), compare_ints);
 
    for (int i = 0; i < size; i++) {
        std::cout << a[i] << " ";
    }
    std::cout << '\n';
}

Output: 

-743 -2 0 2 3 4 99

[Bearbeiten] Siehe auch
durchsucht eine Anordnung für ein Element des angegebenen Typ
Original:
searches an array for an element of unspecified type
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(Funktion) [edit]
Sortiert einen Bereich in aufsteigender Reihenfolge
Original:
sorts a range into ascending order
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(Funktions-Template) [edit]
(C++11)
prüft, ob ein Typ ist trivial
Original:
checks if a type is trivial
The text has been machine-translated via Google Translate.
You can help to correct and verify the translation. Click here for instructions.

(Klassen-Template) [edit]
C documentation for qsort
Von „https://de.cppreference.com/mwiki/index.php?title=cpp/algorithm/qsort&oldid=26103“