d7r1.cpp

这个是常用的数值算法用VC编写的。相信对大家有用哦。

#include "iostream.h"
#include "fstream.h"
#include "math.h"
#include "stdlib.h"

void piksrt(int n, double arr[])
{
	double a;
    for (int j = 2; j<=n; j++)
	{
        a = arr[j];
        for (int i = j - 1; i>=1; i--)
		{
            if (arr[i] <= a)
			{
				break;
			}
			arr[i + 1] = arr[i];
        }
        if (arr[i] > a)
		{
			i = 0;
		}
        arr[i + 1] = a;
    }
}

void main()
{
    //program d7r1
    //driver for routine piksrt

    double a[101];
	int i,j;
	ifstream fin;
	fin.open("d:\\vc常用数值算法集\\data\\tarray.dat",ios::in|ios::nocreate);
	if (!fin)
	{
		cerr<<"could not open d:\\vc常用数值算法集\\data\\tarray.dat"<<endl;
		exit(1);
	}
	for (i=1; i<=100; i++)
	{
			fin>>a[i];
	}
	fin.close();
    //print original array
    cout<<"Original array:"<<endl;
    for (i = 1; i<=10; i++)
	{
        for (j = 1; j<=10; j++)
		{
			cout.width(7);
			cout.setf(ios::left);
            cout<<a[10 * (i - 1) + j];
        }
        cout<<endl;
    }
    //sort array
    piksrt(100, a);
    //print sorted array
	cout<<" "<<endl;
    cout<<"Sorted array:"<<endl;
	cout.width(5); 
    for (i = 1; i<=10; i++)
	{
        for (j = 1; j<=10; j++)
		{
			cout.width(7);
			cout.setf(ios::left);
            cout<<a[10 * (i - 1) + j];
        }
        cout<<endl;
    }
}