[c++] how can i read a line that contains different data types from a file.

[fasoulas]

IN c++

What would be the code if i want to read a line from a file and this line contains numbers of different data types.I want to be able to save each number in a variabe of the same data type.

Example:

1.24 345 3442

[schauerlich]

http://www.cplusplus.com/doc/tutorial/files/

ifstream inf;
double d;
int n, m;

inf.open("foo.txt", ios::in);

inf >> d >> n >> m;

inf.close();

[MindSz]

Maybe somthing like:

cin >> myfloat >> myint1 >> myint2

[fasoulas]

Maybe somthing like:

cin >> myfloat >> myint1 >> myint2

That was what i was thinking but i wasn't sure.

Does c++ has this feature to find different data types in a line?

[fasoulas]

http://www.cplusplus.com/doc/tutorial/files/

I have already checked that and it didn't help

thanks for replying anyway

[MadCow108]

what and how the formated operators (<< >>) read is only determined by the type where it should store or output the data. So put a double type on the right side of it and it will read/write doubles

so to read them all into the same type is easy for doubles because an integer is also a valid double representation for streams

double a[3]
somefilestream >> a[0] >> a[1] >> a[2]; // read in any number into doubles
it will also work for other number formats like 3.23e10

the other way round is not valid, if inputed 1.2 when reading ints will read the one and stop at the dot. subsequent integer reads will thus fail when the .2 is not removed from the stream first

[dwhitney67]

After performing the read operations on the stream, verify that all went well with the good() method (or conversely, with fail()).

double d;
int m, n;

mystream >> d >> m >> n;

if (!mystream.good())
{
   // error parsing data
}

[fasoulas]

After performing the read operations on the stream, verify that all went well with the good() method (or conversely, with fail()).

double d;
int m, n;

mystream >> d >> m >> n;

if (!mystream.good())
{
   // error parsing data
}

ok thanks i will try it