那位大哥可以帮忙解释一下这个程序
if strca culate type <>""and blnflay =false then txt screen=0
else if strca culate type=""and blnflay=ture then txt screen=txt screent"0"
end if
strca culate type="1"
按钮1=va1(txt screen)
按钮2=va1(txt screen)
if strca culate type="1"then
strca culate type=""
blnflay=false