选项
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");}
正确答案：