[Programming] Constants [Variables]

What's up /prog/?

I have a question related to Programming, so I thought, where else to come besides here, right?

So anyway, my question is about constants. Why are they in programming languages? Why can't you just set a variable and then not fucking change it? Please someone enlighten me.

Thanks in advance

What's up /prog/?

I have a question related to Programming, so I thought, where else to come besides here, right?

So anyway, my question is about mutable variables. Why are they in programming languages? Why can't you just use the State monad? Please someone enlighten me.

Thanks in advance.