,,,.,,,,,.,,.

program..,.,,,(program design).

1, ,. 2, ,,,:,. 3,

(321,240),100,.

1, (x y) ,R,(statement)(QBASIC)LET x=320LET y=240LET R=100xR,(assignment),: (1)LETQBASIC,,(keyword),,LET.

(2)xR(variable).,.: LET R=100 LET R=200R,R,R. (3)320,240,100.(constant).QBASIC,:COMPUTER,S=,2008,.(4),=.,:,x=x+1,: LET x=x+1

(5).LET a=10LET a$=good gream come true!(6)LET.,:

CIRCLE (X Y) ,r,4 .(x y),r,4() ,16,(0~15)1-1-1.

SCREEN 13,256.:PAINT (x ,),(x y),4()

,QBASIC,(LET),(READ/DATA)(INPUT),QBSIC,QBSIC(SCREEN,CIRCLE,PAINT)ABSIC.