Simple C++ input from file…how to?

Question

I have a file:

P 0.5 0.6 0.3
30 300
80 150
160 400
200 150
250 300
T
r  45 0 0
s 0.5 1.5 0 0
t 200 –150
.
.
.

When I read in \'P\' I know that

Answer 1

I think you can use standard streams
to check "P" and "T"
use get(char &ch);
and putback(ch) to push it back to stream
and
yourstream >> x >> y >> endl;

http://www.cplusplus.com/reference/iostream/istream/putback/

// Example
// istream putback
#include 
using namespace std;

int main () {  
  char c;  
  int n;  
  char str[256];  

  cout << "Enter a number or a word: ";
  c = cin.get();  

  if ( (c >= '0') && (c <= '9') )
  {  
    cin.putback (c);
    cin >> n;
    cout << "You have entered number " << n << endl;
  }  
  else
  {  
    cin.putback (c);
    cin >> str;
    cout << " You have entered word " << str << endl;
  }  

  return 0;  
}