I have some similar files like this: 15 12 0 0 168 0 2 92 (more numbers)...

I want to extract the first two (in this case: 15 and 12) into integers, how can I accomplish that? By the way, the first two numbers sometime will be unit digits sometimes will be hundreds digits.

CodePudding user response：

Regardless of the language, this will typically consist of the following steps:

1. Open the file
2. Read (formatted) the first two integers
3. Close the file

In C , we can use ifstream

1. To open:

std::ifstream fil;
fil.open("in.txt");

2. To read:

int x, y;
fil >> x >> y;

3. To close:

fil.close();

Make sure to include the fstream header:

#include <fstream>