As suggested in the answer of Linh Dao, I made a respective sample code:
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
void readFromFile(std::istream &in)
{
if (!in.good()) {
std::cerr << "ERROR!" << std::endl;
}
std::string buffer;
std::vector<int> quality;
while (std::getline(in, buffer)) {
if (buffer.size() >= 2 && buffer.compare(0, 2, "ID") == 0) {
std::cout << buffer << std::endl;
quality.clear(); // reset quality vector
} else {
// read numbers
std::istringstream in(buffer); int qual;
while (in >> qual) {
quality.push_back(qual);
std::cout << quality.back() << std::endl;
}
}
}
}
int main(void)
{
#if 0 // in OP
{ std::ifstream fIn("s2.txt");
readFromFile(fIn);
} // fIn goes out of scope -> file is closed
#else // instead
readFromFile(std::cin);
#endif // 0
return 0;
}
Input:
ID 1 (string)
22 30 30 4 2 4 5 7 5 3
22 30 30 4 2 4 5 7 5 3
ID 2
30 4 2 1 2
Output:
ID 1 (string)
22
30
30
4
2
4
5
7
5
3
22
30
30
4
2
4
5
7
5
3
ID 2
30
4
2
1
2
Life demo on ideone.
Note:
The input stream is read line by line (into std::string buffer
).
The further processing depends on whether the input buffer contents starts with ID
.
If not, the buffer
is used with std::istringstream
to extract int
numbers.
If I understood the comment right, the questioner intended to output the whole collected quality
vector in each iteration. Hence, I modified the first sample and added an output operator<<()
for std::vector<int>
:
#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
// a stream operator for vector<int> ouput
std::ostream& operator<<(std::ostream &out, const std::vector<int> &values)
{
const char *sep = "";
for (int value : values) {
out << sep << value; sep = " ";
}
return out;
}
void readFromFile(std::istream &in)
{
if (!in.good()) {
std::cerr << "ERROR!" << std::endl;
}
std::string buffer;
std::vector<int> quality;
while (std::getline(in, buffer)) {
if (buffer.size() >= 2 && buffer.compare(0, 2, "ID") == 0) {
std::cout << buffer << std::endl;
quality.clear(); // reset quality vector
} else {
// read numbers
std::istringstream in(buffer); int qual;
while (in >> qual) {
quality.push_back(qual);
std::cout << quality << std::endl;
}
}
}
}
int main(void)
{
#if 0 // in OP
{ std::ifstream fIn("s2.txt");
readFromFile(fIn);
} // fIn goes out of scope -> file is closed
#else // instead
readFromFile(std::cin);
#endif // 0
return 0;
}
Input: the same like above
Output:
ID 1 (string)
22
22 30
22 30 30
22 30 30 4
22 30 30 4 2
22 30 30 4 2 4
22 30 30 4 2 4 5
22 30 30 4 2 4 5 7
22 30 30 4 2 4 5 7 5
22 30 30 4 2 4 5 7 5 3
22 30 30 4 2 4 5 7 5 3 22
22 30 30 4 2 4 5 7 5 3 22 30
22 30 30 4 2 4 5 7 5 3 22 30 30
22 30 30 4 2 4 5 7 5 3 22 30 30 4
22 30 30 4 2 4 5 7 5 3 22 30 30 4 2
22 30 30 4 2 4 5 7 5 3 22 30 30 4 2 4
22 30 30 4 2 4 5 7 5 3 22 30 30 4 2 4 5
22 30 30 4 2 4 5 7 5 3 22 30 30 4 2 4 5 7
22 30 30 4 2 4 5 7 5 3 22 30 30 4 2 4 5 7 5
22 30 30 4 2 4 5 7 5 3 22 30 30 4 2 4 5 7 5 3
ID 2
30
30 4
30 4 2
30 4 2 1
30 4 2 1 2
Life demo on ideone.