Here is the description of a new assembly language: * 8 registers (R1, R2, R3, R4, R5, R6, R7, R8) that can hold integers. * 1 flag that can hold a boolean value (True or False). * 100 memory addresses (0-99) that can hold integers. * 1 instruction pointer that points to the current instruction being executed. Each instruction is of the form OP ARG1 ARG2 ... where ARGn can be either a register (e.g., R1) or a constant (e.g., 10). Labels are written with a lowercase word followed by colon. The assembly language supports the following instructions: * SET Rx C: Assigns the value C to register Rx. * ADD Rx Ry Rz: Adds the values of Ry and Rz and stores the result in Rx. * (similarly for SUB, MUL, DIV, MOD) * EQ Rx Ry: Sets the flag to True if Rx and Ry are equal, False otherwise. * (similarly for NEQ, LT (Rx < Ry), LTE, GT, GTE) * INC/DEC Rx: Increments/Decrements the value of Rx by one. * JMP L: Jumps to label L unconditionally. * JT/JF (jump if true / jump if false) L: Jumps to label L if the is set or not set. * LOAD Rx M: Loads the value at memory address M into register Rx. * STORE Rx M: Stores the value of register Rx into memory address M. * HCF: Stops the program (with pizzazz) Given this assembly language, write a program that puts the first 20 prime numbers in memory cells 0..19
Here is the description of a new assembly language: * 8 registers (R1, R2, R3, R4, R5, R6, R7, R8) that can hold integers. * 1 flag that can hold a boolean value (True or False). * 100 memory addresses (0-99) that can hold integers. * 1 instruction pointer that points to the current instruction being executed. Each instruction is of the form OP ARG1 ARG2 ... where ARGn can be either a register (e.g., R1) or a constant (e.g., 10). Labels are written with a lowercase word followed by colon. The assembly language supports the following instructions: * SET Rx C: Assigns the value C to register Rx. * ADD Rx Ry Rz: Adds the values of Ry and Rz and stores the result in Rx. * (similarly for SUB, MUL, DIV, MOD) * EQ Rx Ry: Sets the flag to True if Rx and Ry are equal, False otherwise. * (similarly for NEQ, LT (Rx < Ry), LTE, GT, GTE) * INC/DEC Rx: Increments/Decrements the value of Rx by one. * JMP L: Jumps to label L unconditionally. * JT/JF (jump if true / jump if false) L: Jumps to label L if the is set or not set. * LOAD Rx M: Loads the value at memory address M into register Rx. * STORE Rx M: Stores the value of register Rx into memory address M. * HCF: Stops the program (with pizzazz) Given this assembly language, write a program that puts the first 20 prime numbers in memory cells 0..19
### Prime Number Generation Program Here is a program that generates the first 20 prime numbers and stores them in memory cells 0-19:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | ; Initialize variables SET R1 2 ; Starting from 2, the first prime number SET R2 0 ; Counter for prime numbers SET R3 0 ; Flag for primality ; Label for the main loop start: ; Check if R1 is prime SET R3 1 ; Assume R1 is prime SET R4 2 ; Starting divisor SET R5 R1 ; Temporary copy of R1 loop1: ; Check if R4 is a divisor of R1 DIV R5 R4 MOD R5 R5 EQ R5 0 JT not_prime ; If R4 is not a divisor, increment R4 INC R4 LT R4 R1 JT loop1 ; If R1 is prime, store it in memory and increment counter STORE R1 R2 INC R2 LT R2 20 JT done INC R1 JMP start not_prime: ; If R1 is not prime, increment R1 INC R1 JMP start done: ; Stop the program HCF |
I extracted the following code from that output:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 | ; Initialize variables SET R1 2 ; Starting from 2, the first prime number SET R2 0 ; Counter for prime numbers SET R3 0 ; Flag for primality ; Label for the main loop start: ; Check if R1 is prime SET R3 1 ; Assume R1 is prime SET R4 2 ; Starting divisor SET R5 R1 ; Temporary copy of R1 loop1: ; Check if R4 is a divisor of R1 DIV R5 R4 MOD R5 R5 EQ R5 0 JT not_prime ; If R4 is not a divisor, increment R4 INC R4 LT R4 R1 JT loop1 ; If R1 is prime, store it in memory and increment counter STORE R1 R2 INC R2 LT R2 20 JT done INC R1 JMP start not_prime: ; If R1 is not prime, increment R1 INC R1 JMP start done: ; Stop the program HCF |
list index out of range Resulting in output: False