Question

How can i tell programm to read firstly from the 1st line, to check “n” and then to read as many numbers as “n”?

e.g. if n=5, the program must read 5 numbers from the second line. if n=0, it will read nothing.

can anyone help?

Answer 1

Something simple like this would work. Here you are reading a totalNum and reading totalNum numbers into the vector.

#include <iostream>
#include <vector>

using namespace std;
int main()
{

  int totalNum = 0;
  cin >> totalNum;
  std::vector<int> numArr;
  while( totalNum-- > 0 )
  {
      int num = 0;
      cin >> num;
      cout << "Read " << num << endl;
      numArr.push_back(num);
  }

  cout << "Numbers are ";
  for ( int i = 0; i < numArr.size(); ++i )
      cout << numArr[i] << " ";
  cout << endl;

  return 0;
}