Programming and Graphics

138 Introduction to C++ Programming and Graphics

These two statements can be replaced by the single statement:

sort(v, v+N)

which confirms that the vectorvis passed to the function as a pointer.

The following code contained in the filesorting.ccuses thesortfunction
of the STL to sort and then print a list:

#include <iostream>

#include <iomanip>

#include <algorithm>

using namespace std;

int main()

{

const int N=7;

float v[N]={10.0, -9.4, 3.4, -3.4 -10.8, 199.0, -3.56};

sort(v, v+N);

cout<< setiosflags(ios::fixed | ios::showpoint);

for(int i=0;i<=N-1;i++)

{

cout << setw(3) << i << " " << setw(6) << setprecision(2)

<< v[i] << endl;

}

return 0;

}

Note that we have included the header filealgorithmof the STL. Running the
code prints on the screen:

0 -14.20

1 -9.40

2 -3.56

3 0.00

4 3.40

5 10.00

6 199.00

If we only want to sort a subset of the list, we can state, for example,

float * pnt = &v[3];

sort(pnt, pnt+2);