求算术表达式的值　①x+a%3*(int)(x+y)%2/4设x
　①x+a%3*(int)(x+y)%2/4 设x=2.5,a=7,y=4.7 ②(flt)(a+b)/2+(int)x%(int)y 设a=2,b=3,x=3.5,y=2.5
①x+a%3*(int)(x+y)%2/4 =2.5 ②(float)(a+b)/2+(int)x%(int)y =3.5