A.Wear a seat belt each time he drives. B.Stop children riding in the front seat. C.Make the front seat passenger wear a seat belt. D.Make the front seat children under 14 wear a seat belt.
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举一反三
【单选题】有下列程序: main { int k=5,n=0; while(k>0) {switch(k) {default:break; case 1:n=n+k; case 2: case 3:n+=k; } k--; } printf("%d\n".n); } 程序运行后的输出结果足( )。