stream problem

[vsgdp]

Hello,

I'm wondering why this outputs garbage:

std::ofstream outFile("test.t xt");

outFile << 1.0f << std::endl;
outFile << filename << std::endl;
outFile << 2.0f << std::endl;
std::string s;
float x;
std::ifstream inFile("test.tx t");
inFile >> x;
std::cout << x << std::endl;
std::getline(in File, s, '\n');
std::cout << s << std::endl;
inFile >> x;
std::cout << x << std::endl;

and why this works:

outFile << filename << std::endl;
outFile << 1.0f << std::endl;
outFile << 2.0f << std::endl;
std::string s;
float x;
std::ifstream inFile("test.tx t");
std::getline(in File, s, '\n');
std::cout << s << std::endl;
inFile >> x;
std::cout << x << std::endl;
inFile >> x;
std::cout << x << std::endl;

I think the former doesn't work because the getline() is reading the same
line as the previous inFile >> read. How can I get it to skip to the next
line, if that is indeed the problem.

[John Harrison]

Re: stream problem


"vsgdp" <nospam@nospam. com> wrote in message
news:LMr2b.1046 3$Qy4.4180@fed1 read05...[color=blue]
> Hello,
>
> I'm wondering why this outputs garbage:
>
> std::ofstream outFile("test.t xt");
>
> outFile << 1.0f << std::endl;
> outFile << filename << std::endl;
> outFile << 2.0f << std::endl;
> std::string s;
> float x;
> std::ifstream inFile("test.tx t");
> inFile >> x;
> std::cout << x << std::endl;
> std::getline(in File, s, '\n');
> std::cout << s << std::endl;
> inFile >> x;
> std::cout << x << std::endl;
>
> and why this works:
>
> outFile << filename << std::endl;
> outFile << 1.0f << std::endl;
> outFile << 2.0f << std::endl;
> std::string s;
> float x;
> std::ifstream inFile("test.tx t");
> std::getline(in File, s, '\n');
> std::cout << s << std::endl;
> inFile >> x;
> std::cout << x << std::endl;
> inFile >> x;
> std::cout << x << std::endl;
>
> I think the former doesn't work because the getline() is reading the same
> line as the previous inFile >> read.[/color]

Not quite.

getline is doing what it is supposed to which is reading up to the next
newline. Your mistake is thinking that inFile >> x will read a newline, but
it doesn't. inFile >> x reads a number and a newline is not part of a
number. So when you have a number followed by a newline the newline is left
behind unread. Then getline comes along and reads it.
[color=blue]
> How can I get it to skip to the next
> line, if that is indeed the problem.
>[/color]

Use getline twice?

john

[Ron Natalie]

Re: stream problem


"John Harrison" <john_andronicu s@hotmail.com> wrote in message news:bidnc9$87l 3m$1@ID-196037.news.uni-[color=blue][color=green]
> > How can I get it to skip to the next
> > line, if that is indeed the problem.
> >[/color]
>
> Use getline twice?
>[/color]
or ignore.