Hey Guys , thanks for your help
I finally made it work :]
Feel quite good as it was my first application, not completly done by myself, but thanksfully to your advices I found the answers.
I had 3 counters,
int wrong; to store bad guesses
int guessright; to store good ones
int fwronf; to so store multiplications of bad ones...
setting counters to 0; every time do..while loop starts.