汇编语言判断素数基于masm

以下是基于 MASM 的汇编语言程序，用于判断一个输入的整数是否为素数：

.386
.model flat,stdcall
.stack 4096
ExitProcess PROTO, dwExitCode:DWORD

.data
    msg1 db "Enter a number: ", 0
    msg2 db " is a prime number.", 0
    msg3 db " is NOT a prime number.", 0
    num dd ?

.code
main PROC
    ; Display message to enter a number
    mov eax, offset msg1
    call WriteString

    ; Read integer input from user
    call ReadInt
    mov num, eax

    ; Check if input number is prime
    mov ecx, 2
    mov ebx, 0
L1:
    mov edx, 0
    div ecx
    cmp edx, 0
    je L2
    inc ecx
    cmp ecx, num
    jne L1
    mov ebx, 1
L2:

    ; Display result
    mov eax, num
    call WriteInt
    cmp ebx, 0
    je not_prime
    mov eax, offset msg2
    call WriteString
    jmp exit_prog
not_prime:
    mov eax, offset msg3
    call WriteString
exit_prog:
    invoke ExitProcess, 0
main ENDP

; Function to read integer input from user
ReadInt PROC
    push ebp
    mov ebp, esp
    sub esp, 8
    mov eax, 3
    mov edx, offset num
    mov ecx, 10
    call ReadConsole
    mov eax, num
    add esp, 8
    pop ebp
    ret
ReadInt ENDP

; Function to display integer value
WriteInt PROC
    push ebp
    mov ebp, esp
    sub esp, 8
    mov eax, 1
    mov edx, offset num
    mov ecx, 10
    call WriteConsole
    add esp, 8
    pop ebp
    ret
WriteInt ENDP

; Function to display string
WriteString PROC
    push ebp
    mov ebp, esp
    sub esp, 8
    mov eax, 0
    mov edx, [ebp + 8]
    call WriteConsole
    add esp, 8
    pop ebp
    ret
WriteString ENDP

END main

该程序的实现思路是，先读取用户输入的整数，然后从2开始逐个除以整数，并判断余数是否为0。如果余数为0，则说明该整数不是素数，否则继续除以下一个整数，直到除到该整数本身为止。如果除到最后都没有余数为0，则说明该整数是素数。

注意，该程序只能判断输入的整数是否为素数，没有做输入合法性检查。如果输入的不是整数，程序会出现异常。