求最大最小值.cpp

求数据文件中的最大值与最小值

/*/////////////////////////////////////////////////////////
Func:求数据文件中的最大值与最小值，与它们之间的差
///////////////////////////////// zhao 2002/9/2 /////////*/

#include <fstream.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>

#include <stdio.h>
#include <conio.h>
#include <iostream.h>

void main()
{

	char fin[50]={'\0'};
	char fout[50]={'\0'};

	cout<<"Type the file :";
	cin>>fin;

	strncpy(fout,fin,strlen(fin)-4);
	strcat(fout,"_result.dat");

    ifstream source(fin);
    ofstream result(fout);
    if(!source)
	{
	    cout<<"can't open file"<<fin<<endl;
        return;
	}
    if(!result)
	{
        cout<<"can't create file"<<fout<<endl;
        return;
	}

    float sdata=0;
	float max=0;
	float min=0;
    float range;
	source>>sdata;
	max=sdata;
	min=sdata;
	
    while(!source.eof())
	{
		source>>sdata;
	    if(sdata>max) 
		{
             max=sdata;
		}
		else if(sdata<min)
		{
			 min=sdata;
		}		
	}

	range=max-min;

	result<<max;
	result<<"\n";
    result<<min;
	result<<"\n";
	result<<range;
	result<<"\n";

    source.close();
    result.close();
}