单项选择题
A.int n1=n2=10; B.char c=32; C.float f=f+1.1; D.double x=12.3E2.5;
A.1/3*sin(1/2)*sin(1/2) B.sin(0.5)*sin(0.5)/3 C.pow(sin(0.5),2)/3 D.1/3.0*pow(sin(1.0.2),2)
A.k%2 B.k%2==1 C.(k%2)!=0 D.!k%2==1