單項(xiàng)選擇題

以下程序運(yùn)行后輸出結(jié)果是（）
#define F(m, n) m*n
Main()
{int x=5, y=3, a1, a2;
a1=F(x+y, x-y) ;
a2=F(x-y, x+y) ;
printf(＂ %d, %d\n, a1, a2＂ ) ; }

A.16，16
B.16，-16
C.-7，17
D.17，-7


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5.單項(xiàng)選擇題下列（）對(duì)結(jié)構(gòu)類型變量定義是錯(cuò)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;