以下程序运行后，a的值是（ ）。main(){ int a,b; for(a=1,b=1;a { if(b>=20) break; if(b%3==1) { b+=3; continue; } b-=5; }}
If you are a buyer on alibaba.com and want to contact sellers, you may simply click the “contact now” button to send quotation. （ ）