You will see the following abbreviations commonly used.
Statement
v++;
abbreviates
v = v + 1;
It adds 1 to variable v.
Statement
v--;
abbreviates
v = v - 1;
It subtracts 1 to variable v.
Statement
v += x;
abbreviates
v = v + x;
You can use -=, *=, /=, etc. For example,
v *= x;
abbreviates
v = v * x;
Questions.