* + - / ^ is just math. I assume you got those math sums at school already? Every numerical value in a programming language can be changed using numerical instructions, such as * + - etc.
So, one could also type:
For a=10/5+9 to 99*4-4/2+49
Ok, doesn't make sense, but it works.
So, one could also type:
For a=10/5+9 to 99*4-4/2+49
Ok, doesn't make sense, but it works.