执行下列程序段后，变量a,b,c的值分别是( )。 int x=5,y=4; int a,b,c; a=(--x==y++)x:++y; b=++X; C=y;

A．struct {int x; float y; int a[2]; unsigned b[3]; char name[10]; };
B．structstu { unsigneda[3]; unsigned b[4]; }x; int*p=&a;
C．struc tsu { int a; float x[4]; }y={1,1.0}; floatdat a=x;
D．stmct nd {int a,b; unsigned c[2]=5; };