What do these ( += , -= , *= , /= ) Operators Mean? [closed]

Answer 1

these are shorthand operators.
these are used when you does the operation & stores result into one of the variable between them. that is you store result into one of your operand suppose example
1)x=x+y;
here you can do x+=y;
ex 2) x=x+1;
here you can do x+=1;