You're trying to use the bitwise AND operator (with a string for some reason?) and you shouldn't be.
You've missed the semi-colon at the end of the line.
What gui library are you using? Do you have to set the value of the progress bar as a percentage? Or do something like set the max value of the bar when you declare it, and then then the value?
no i didn't use the percentage and i'm coding in the form1.h so i didn't use any library.
P.S: I started coding like for 3 weeks so i don't really now "nothing" since i only have 13 years and i wanted some base for the T.I.C class
So it's CLR. that youtube clip i posted might be of use then.
edit: if this isn't an assignment, and you are just wanting to do some preparation before a class starts (good idea by the way), may I suggest you stay away from the GUI stuff to begin with and go through the c++ tutorials on this website.