prog3.txt

#include<iostream>
#include<fstream>
using namespace std;

void ArraySum(int n,double x,double y)
{
	int *a;
	a=new int[n];
	int sum=0;
	ifstream f("D:\\a.txt");
	for(int i=0;f>>a[i],i<n;i++)
		if(a[i]>=x&&a[i]<=y) sum+=a[i];
	cout<<sum<<endl;
	delete []a;
}

int main(void)
{
	int n;//数组长度
	double x;//求和元素最小值
	double y;//求和元素最大值
	cout<<"数组长度"<<endl;
	cin>>n;
	cout<<"求和元素最小值"<<endl;
	cin>>x;
	cout<<"求和元素最大值"<<endl;
	cin>>y;
	ArraySum(n,x,y);
	return 0;
}