Question

c++考试中帮个忙。从键盘输入不少于五个整数，将其中的奇数存入文件e：odd.txt,将其中的偶数存入

e:\even.txt,并在每个文件的最后一行输出对应的奇偶数个数。

Answer 1

#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;

int main()
{
int n, a[100], i, odd, even;
cout<<"输入整数的个数："<<endl;
cin >> n;
cout<<"请输入"<<n<<"个整数"<<endl;
for(i=0; i<n; i++) {
cin >> a[i];
}

ofstream f1("e:\\odd.txt"), f2("e:\\even.txt");
odd = 0, even = 0;
for(i=0; i<n; i++) {
if(a[i] % 2 == 1) {
f1 << a[i]<<endl;
odd ++;
}
else {
f2 << a[i] <<endl;
even ++;
}
}
f1 <<odd<<endl;
f2 <<even<<endl;
f1.close();
f2.close();
system("pause");
}

Answer 2

#include<iostream>
#include<fstream>
#include<vector>
using namespace std;
int main()
{
vector<int> ivec,qvec,ovec;
int n;
while(cin>>n)
{
ivec.push_back(n);
}
for(vector<int>::iterator it=ivec.begin();it!=ivec.end();++it)
{
if(*it%2==0)
ovec.push_back(*it);
else
qvec.push_back(*it);
}
ofstream outfile;
outfile.open("e:\even.txt");
if(!outfile)
cout<<"open failed!"<<endl;
for(vector<int>::iterator it=qvec.begin();it!=qvec.end();++it)
{
outfile<<*it<<" ";
}
outfile<<endl<<qvec.size();
outfile.close();
outfile.open("e:\odd.txt");
if(!outfile)
cout<<"open failed!"<<endl;
for(vector<int>::iterator it=ovec.begin();it!=ovec.end();++it)
{
outfile<<*it<<" ";
}
outfile<<endl<<ovec.size();
outfile.close();
return 0;
}