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【单选题】
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(a+b) { case 1: printf("*\n"); case 2+1: printf("**\n"); }
B.
switch((int)x); { case 1: printf("*\n"); case 2: printf("**\n"); }
C.
switch(x); { case 1.0: printf("*\n"); case 2.0: printf("**\n"); }
D.
switch(a+b) { case 1: printf("*\n"); case c: printf("**\n"); }
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