Arrays / Expanding dynamic size array by using std vector / Essential C++
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#include <algorithm> // std::sort
#include <iostream>
#include <vector> // std::vector
using namespace std;
int int_from( std::istream& in ) { int x = 0; in >> x; return x; }
int main()
{
cout << "Sorting integers provided by you.\n";
cout << "You can indicate EOF via F6 in Windows or Ctrl+D in Unix-land.\n";
vector<int> a; // ← Zero size by default.
while( cin )
{
cout << "One number, please, or indicate EOF: ";
int const x = int_from( cin );
if( !cin.fail() ) { a.push_back( x ); } // Expands as necessary.
}
sort( a.begin(), a.end() );
int const n = a.size();
for( int i = 0; i < n; ++i ) { cout << a[i] << ' '; }
cout << '\n';
}
Cpp
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