Deven is a simple programming Language created for my friend Deven.

1. p: Pushes the follwoing integer onto the Stack
2. i: Reads a char from the console and pushes its ascii value onto the Stack. This only reads the first char. All follwoing chars are ignored.
3. o: prints the top element of the Stack as an ascii char
4. P: Pops the top element from the stack
5. a: Adds the top two Elements of the stack together and stores the result on the stack
6. s: Subtracts the top two Elements of the stack together and stores the result on the stack
7. j: Jumps relatively to the current position by the amount stored on top of the stack if the second top value on the stack is 1
8. d: Duplicates the i-th element from the stack where i is the integer following the command
9. D: Deletes the i-th element from the stack where i is the integer following the command
10. e: Checks if the top two elements are equal. If yes it pushes 1 onto the stack otherwise 0.
11. S: Checks if the second element from top is smaller than the top element on the stack. If yes it pushes 1 onto the stack otherwise 0.

When starting a new subroutine, the stack should always have the return address relative to the routine end followed by the arguments on top of it.

There are five examples available:

1. python3 deven.py examples/helloworld.deven Prints "Hello World" to the console
2. python3 deven.py examples/add.deven Asks for two numbers and adds them together. Result has to be between 0-9 in order to be displayed correctly
3. python3 deven.py examples/modulo.deven 17 10 Calculates modulo (in this case 17%10) and stores the result on top of the stack
4. python3 deven.py examples/primes.deven 111 Checks if a number (in this case 111) is prime. If yes it will put 1 on top of the stack, otherwise 0.
5. python3 deven.py examples/primelist.deven 20 Outputs for each number in the interval [2,..,n-1] wheter it is prime and outputs "y" if it is and "n" otherwise. In this case it would check from 2 to 19 and the output would be yynynynnnynynnnyny