switch语句？
若有定义：“float x=1.5; int a=1, b=3, c=2;”，则正确的switch语句是。A.
switch (x)
{ case 1.0: printf(“*\n”);
case 2.0: printf(“**\n”);
}
B.
switch((int)x);
{ case 1: printf(“*\n”);
case 2: printf(**\n”);
}
C.
switch(a+b)
{ case 1: printf(“*\n”);
case 2+1: printf(“**\n”);
}
D.
switch(a+b)
{ case 1: printf(“*\n”);
case c: printf(“**\n”);
}
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