Mega Code Archive
Read integer from a text file
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#include <fstream>
#include <iostream>
#include <vector>
#include <string>
#include <stdexcept>
using namespace std;
void readIntegerFile(const string& fileName, vector<int>& dest)throw (invalid_argument, runtime_error)
{
ifstream istr;
int temp;
istr.open(fileName.c_str());
if (istr.fail()) {
string error = "Unable to open file " + fileName;
throw invalid_argument(error);
}
while (istr >> temp) {
dest.push_back(temp);
}
if (istr.eof()) {
istr.close();
} else {
istr.close();
string error = "Unable to read file " + fileName;
throw runtime_error(error);
}
}
int main(int argc, char** argv)
{
vector<int> myInts;
const string fileName = "test.txt";
try {
readIntegerFile(fileName, myInts);
} catch (const invalid_argument& e) {
cerr << e.what() << endl;
exit (1);
} catch (const runtime_error& e) {
cerr << e.what() << endl;
exit (1);
}
for (unsigned int i = 0; i < myInts.size(); i++) {
cout << myInts[i] << " ";
}
cout << endl;
return (0);
}
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