單項選擇題若已定義int a=3,b=3,x=1,y=2;表達式(a=y>x)&&(x=b>a)的值是()。

A.6
B.1
C.9
D.0


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4.單項選擇題下列()對結(jié)構(gòu)類型變量定義是錯誤的。

A.struct teacher {int num; int age; } teach1;
B.struct {int num; int age; } teach1, teach2;
C.struct {int num; int age; } teacher; struct teacher teach1;
D.struct teacher {int num; int age; } ; struct teacher teach1;