@echo off&setlocal enabledelayedexpansion

rem ------------------------------
rem 创建两个矩阵
rem ------------------------------

call :create a.txt A
call :create b.txt B

rem -----------------------------
rem  验证是否可以进行矩阵乘法
rem -----------------------------

if not !lie_A! equ !hang_B! (
   echo 两矩阵无法相乘
   pause>nul
   goto :eof
)

rem ------------------------------
rem   矩阵相乘
rem ------------------------------

echo.&echo  The result is:&echo.
set /a hang_A-=1,lie_B-=1,lie_A-=1
for /l %%i in (0 1 !hang_A!) do (
    for /l %%j in (0 1 !lie_B!) do (
        for /l %%k in (0 1 !lie_A!) do (
            set /a tmp=.A%%i%%k*.B%%k%%j
            set /a result+=tmp
        )
        call :unify
        set /p= !result!<nul
        set /a result=0
    )
    echo.
)
pause>nul
goto :eof

rem ----------------------------
rem 子程序：创建矩阵
rem ----------------------------

:create
set /a i=0
for /f "delims=" %%a in (%~1) do (
     set /a j=0
     set "str=%%a"
     for %%b in (!str!) do (
        set .%~2!i!!j!=%%b
        set /a j+=1
     )
     set /a i+=1
)
set /a hang_%~2=i,lie_%~2=j
goto :eof

rem -----------------------------
rem 子程序：统一输出格式
rem -----------------------------

:unify
if !result! lss 100 set "result= !result!"
if !result! lss 10  set "result= !result!"
goto :eof
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