Firstly, sorry for my english
Secondly would you mind telling me, why are you so lazy? Debbuger tells you what the problem is. I just made account here and read regulations; don't make other homework, if possible hint only. I recognise youre programm as homework(sorry if I'm wrong). So here comes a hint: there is something missing in #include part
Decimal numbers in C++ use "." to separate the integer and fraction part, not ",". In other words, it's 3.14, not 3,14. So I think you mean c=g/3.6*100 instead of c=g/3,6 * 100.
Unfortunately the latter is legal C++ syntax and is basically the same as:
1 2
c = g/3;
6 * 100; // compute 6*100 and throw away the result.