How to read an integer group in the file in C

1213 153 15 155
84 866 89 48
12
12 12 58
12

int main() {< br /> std::vector v( std::istream_iterator(std::cin), 
 std::istream_iterator() );
}

int main()
{
 std::string line;
 std::vector< std::vector> all_integers;
 while (getline( std::cin, line)) {
 std::istringstream is( line );
 all_integers .push_back( 
 std::vector( std::istream_iterator(is),
 std::istream_iterator()) );
 }
}

I have a text file, each line contains one or more integers, separated by spaces. How can I read this in C in an elegant way? If I don’t care about the line, I can use cin>>, but the important thing is which line is an integer.

Input example:

1213 153 15 155
84 866 89 48
12
12 12 58
12

It depends on you Do you want to go line by line or a full set. Convert the entire file to a vector of integers:

int main() {
 std::vector v( std::istream_iterator(std::cin), 
 std::istream_iterator() );
}

If you want to process per line :

int main()
{
 std::string line;
 std::vector< std::vector > all_integers;
 while (getline( std::cin, line)) {
 std::istringstream is( line );
 all_integers.push_back( 
 std::vector< int>( std::istream_iterator(is),
 std::istream_iterator()) );
 }
}