Answer 1

int x=10, a=0, b=0;
// pre-increment operator ++x
a=++x; // a=11, x=11
// post-increment operator x++
b=x++; // b=11, x=12
// here two operation are performed first is addition of 1 and x and then assignment of addition into variable x
x=x+1; // x=13
// compund assignment operation +=
x+=1; // x=14