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C++ cstdlib qsort() Ghumarwin
- Location: Ghumarwin, Himachal Pradesh, India
qsort() is a standard library C++ cstdlib qsort() (from the cstdlib header) that implements the quicksort algorithm. It allows sorting an array of elements using a user-defined comparison function.
Syntax:
void qsort(void* base, size_t num, size_t size, int (*compar)(const void*, const void*));
Parameters:
base: Pointer to the first element of the array.
num: Number of elements in the array.
size: Size of each element in bytes.
compar: Pointer to the comparison function, which determines the order of elements.
Usage Example:
#include <cstdlib>
#include <iostream>
int compare(const void* a, const void* b) {
return (*(int*)a - *(int*)b);
}
int main() {
int arr[] = {3, 1, 4, 1, 5, 9};
size_t size = sizeof(arr) / sizeof(arr[0]);
qsort(arr, size, sizeof(int), compare);
for (int i = 0; i < size; i++) {
std::cout << arr[i] << " ";
}
return 0;
}
Key Points:fv
qsort() is useful for sorting arrays of any type by customizing the comparison function.
Use caution with typecasting in the comparison function.
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