$.$ For the following questions use switch statements.

a$.$ Write Java codes to implement the following problem: if the user enters $5$ cents the system prints $5$ cents added$,$ if the user enters $10$ cents the system prints $10$ cents added$,$ if the user enters $25$ cents the system prints $25$ cents added$,$ if the user enters $1$ dollar the system prints $100$ cents added$.$ If the user enters other coins then print $$Entered coin not supported$.$

b$.$ Write java codes to implement the following problem: if the user enters $$A$$ then call the calculator method add $($Calculator$.$add$($val$1,$ val$2)),$ if the user enters $$M$$ then call the calculator method multiply $($Calculator$.$mult$($val$1,$ val$2)),$ if the user enters $$D$$ then call the calculator method divide $($Calculator$.$divide$($val$1,$ val$2)),$ if the user enters $$S$$ then call the calculator method subtract $($Calculator$.$subtract$($val$1,$ val$2)),$ and If the user enters other characters then print $$Code not supported$.$