CODEWITHSUNDEEP
c++ifstream
bluePhlavio
bluePhlavio

Reputation: 547

read data up to '\n'

I have an input file for my program that stores the values to use for two parameters.

# X parameter values to use
10 20 30 40
# Y parameter values to use
5

The number of the values are not fixed but is the client that choose how many values to use (in this example 4 for X and 1 for Y (could be 0 too)). If I do an

ifstream in("input.in");
int value;
in >> value >> value >> ...

the program don't stops at the end of the line and reads obviously also Y line for X values when the X line ends. How to stop reading at the end of the line? I want to read values untill in found the '\n'. Thanks!

Upvotes: 2

Views: 44

Answers (1)

Benjamin Lindley
Benjamin Lindley

Reputation: 103693

std::string line;
std::getline(in, line);

Now you have the line as a string (#include <string>) and need to parse it. You can do it the same way as before by making use of std::istringstream (#include <sstream>).

std::istringstream iss(line);
while (iss >> value) // read until failure
{
    // process value
}

Upvotes: 4

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