实在是看不懂,答案是D
A.
switch (pow(a,2)+pow(b,3))
{
case 1:
case 2: y=a+b;break;
case 0:
case 5: y=a-b;break;
}
B.
switch (a+b)
{
case1:
case2: y=a+b;break;
case3:
case5: y=a-b;break;
}
C.
switch a
{
default: y=a+b;break;
case 3:y=a-b;break;
case 5: y=a*b;break;
}
D.
switch (a*a+b*b)
{
case 5:
case 3: y=a+b;break;
case 1: y=a-b;break;
}