A、switch(w) { case 1.0: printf("*\n"); case 2.0: printf("**\n"); }
B、switchA.; { case 1 printf("*\n"); case 2 printf("**\n");}
C、switchB.{ case 1: printf("*\n"); default: printf("\n"); case 1+2: printf("**\n");}
D、switch(a+b);{ case 1: printf("*\n");case 2: printf("**\n");default: printf("\n");
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