void main(){ while(1) { key_saomiao(); switch(flag) { case 0:seg_xs(key);break; case 1:add=1;key1=key;break; case 2:sub=1;key1=key;break; case 3:mul=1;key1=key;break; case 4:clean=1;key=0;seg_xs(key);break; case 5:result();break; case 6:div=1;key1=key;break; } }}