类方法那里有问题，总是打开失败，去掉后信息成功写入文件
if（！fout.is_open()）;每次都是打开失败然后退出，去掉后就写入信息了
#include <iostream>
#include <fstream>
#include <cstdlib>
using namespace std;
void fileit(ostream&os,double fo,const double fe[],int n);
const int LIMIT = 5;
int main()
{
ofstream fout;
const char * fh ="1.txt";
fout.open(fh);
if(!fout.is_open());
{
system("pause");
exit(EXIT_FAILURE);
}
double objective;
cout<<"Enter the focal length of your telescopr objective in mm";
cin>>objective;
double eps;
cout<<"Enter the focal lengths, in mm, of "<<LIMIT<<"eyepieces:\n";
for(int i = 0;i < LIMIT;i++)
{
cout<<"Eyepices #"<<i + 1<<": ";
cin>>eps;
}
fileit(fout,objective,eps,LIMIT);
fileit(cout,objective,eps,LIMIT);
system("pause");
return 0;
}
void fileit(ostream&os,double fo,const double fe[],int n)
{
ios_base::fmtflags initial;
initial = os.setf(ios_base::fixed);
os.precision(1);
os.width(12);
os<<"f.1. eyepiece";
os.width(15);
os<<"magnification"<<endl;
for(int i = 0;i < n;i++)
{
os.width(12);
os<<fe;
os.width(15);
os<<int(fo/fe + 0.5)<<endl;
}
os.setf(initial);
}
自己2B了，后面有个分号，怪不得 {:10_277:}
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