# C++sort function Usage __jquery

Source: Internet
Author: User

Definition in MSDN: Template<class ranit>
void Sort(Ranit-I, ranit last); --> 1)
Template<class Ranit, Class pred>
void Sort(Ranit, Ranit last, Pred PR); --> 2)

#include <algorithm>
using namespace Std;

1. The default sort function is in ascending order. Corresponds to 1)
Sort (a,a+n); Two parameters are the first and end addresses of the array to be sorted, respectively
2. You can write a CMP function by yourself, sorted by specific intent. Corresponds to 2)
For example:
int cmp (const int &A, const int &b) {
if (a > B)
return 1;
Else
return 0;
}
Sort (a,a+n,cmp);
Is array a descending sort
Another example:
int CMP (const point &a, const point &b) {
if (a.x < b.x)
return 1;
Else
if (a.x = = b.x) {
if (A.y < B.Y)
return 1;
Else
return 0;
}
Else
return 0;
}
Sort (a,a+n,cmp);
is sorted by x in ascending order, or Y ascending if x is equal

Similar to the qsort in C, the following is attached to the Qsort method of use:

#include <stdlib.h>

Format qsort (array_name,data_number,sizeof (data_type), Compare_function_name) (void*) bsearch (Pointer_to_key_word, Array_name,find_number,

sizeof (data_type), compare_function_name)

e.g.

int Cmp (const void*a,const void *b)

{

Int*pa= (int*) a,*pb= (int*) b;

if (*PA>*PB) return 1;

else if (*PA==*PB) return 0;

else return-1;

}

Qsort (data,n,sizeof (int), CMP); Quick sort on int arrays (not in descending order)

p= (int*) bsearch (&a,data,n,sizeof (int), CMP);

Related Keywords:

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