程序代码：

;#Mode=CON
;MASMPlus 单文件代码模板 - 控制台程序
;--------------------------------------------------------------------
;单个文件需要指定编译模式,否则默认是EXE方式,在系统设置中可以设置默认是DOS还是Windows.
;编译模式自带了DOS/COM/CON/EXE/DLL/LIB这几种,如果有必要,可以更改ide.ini添加新的编译模式
;当然,更好的是创建为一个工程.更方便及易于管理,使用方法:按Ctrl多选->创建工程.必须有多个文件

.386
.model flat, stdcall
option casemap :none

include Irvine32.inc
include windows.inc
include user32.inc
include kernel32.inc
include masm32.inc

includelib user32.lib
includelib kernel32.lib
includelib masm32.lib
include macro.asm

.data
count    DWORD ?
outmsg    BYTE "输入一个0~100之间的数:", 0

.code
main    proc
    mov edx, offset outmsg
    call WriteString
    call ReadDec
    mov count, eax
   
    .if eax>=90 && eax<=100
        mov al, 'A'
    .elseif eax>=80 && eax<=89
        mov al, 'B'
    .elseif eax>=70 && eax<=79
        mov al, 'C'
    .elseif eax>=60 && eax<=69
        mov al, 'D'
    .elseif eax>=0 && eax<=59
        mov al, 'F'
    .endif
   
    call WriteChar
    call Crlf
    call WaitMsg
    invoke ExitProcess, 0
main    endp
end    main