vfp中用循环语句编写下列图形的程序?+ +=+ +=+=+ +=+=+=+ +=+=+=+=+

上机验证过了,正确.
clear
set talk off
for i=1 to 5
?space(20-i)
for j=1 to 2*i-1
if mod(j,2)=0
?"="
else
?"+"
endif
endfor
endfor
return