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Man Pages
double_cmp(3) FreeBSD Library Functions Manual double_cmp(3)

#include <xtend/math.h>
-lxtend

int     double_cmp(const double *n1, const double *n2)

n1, n2  Pointers to two double values

This is a function that compares two doubles as a service to polymorphic functions such as qsort(3), bsearch(3), etc. The address of double_cmp() is passed as an argument to perform the data type specific comparison on behalf of the sort of search function.

A value > 0 if *n1 is greater than *n2 A value < 0 if *n1 is less than *n2 0 if the values are equal

double  list[LIST_SIZE];
// sizeof(*list) will continue to work if we change the data type
// We'll still need to change the cmp function, though
qsort(list, LIST_SIZE, sizeof(*list),
      (int (*)(const void *, const void *))double_cmp);

qsort(3), heapsort(3), mergesort(3), bsearch(3)


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