C Programming Language

I only have 120 minutes, please help me.

Create a calculator application with textual input. The calculator has 10 memory slots with identifiers from 0 to 9. You can read integer numbers to the slots and you can perform arithmetic operations on them. All these operations are controlled textually. The initial value of the slots is 0. Let's take the following example:

read 10 1

read 20 3

read 30 7

add 1 2 9

mul 3 1 6

print 9

print 6