A simple bytecode interpreter, inspired by the the Advent of Code

Integer codes implemented so far:

• 1(arg0 arg1 arg2): sums the values referred to by arg0 and arg1 and writes it to the location referred to by arg2
• 2(arg0 arg1 arg2): multiplies the values referred to by arg0 and arg1 and writes it to the location referred to by arg2
• 3(arg0): reads a value from the input tape and stores it in the location referred to by args0
• 4(arg0): writes to the output tape the value referred to by args0
• 5(arg0 arg1): if arg0 is not zero, jumps to arg1
• 6(arg0 arg1): if arg0 is zero, jumps to arg1
• 7(arg0 arg1 arg2): writes 1 to the location referred to by arg2 if arg0 is less than arg1, 0 otherwise
• 8(arg0 arg1 arg2): writes 1 to the location referred to by arg2 if arg0 is equal to arg1, 0 otherwise
• 99: terminate execution

Integer codes are assumed to have 5 digits. The last two digits identifies the operation as described as above. The first, second and third digits determine the mode of the first second and third arguments:

• 0: read the value from the location given by the argument
• 1: immediate mode, the argument is the value to be used in the operation If an argument refers to a store location (eg, the third argument for code 1, or the first one for code 5), the argument cannot be in imediate mode.