if/of streams

[subzero06]

Hello, im stuck writting this little program.

outdata.open("currentsales");

outdata <<  ????;

indata.open("projectedsales");

indata >>  ???? * 2 >> endl;



indata.close();
outdata.close();

Im supposed to write the other statements necessary to read one integer from a file called currentsales and write twice its value into a file called projectedsales .