class CCalculator{
    int a,b,c;
void set_value(int x,int y,int z){
    a=x;
    b=y;
    c=z;
}
void show(){
    System.out.println("a="+a+" b="+b+" c="+c);
}
int add(){
    return a+b+c;
}
int sub(){
    return a-b-c;
}
int mul(){
    return a*b*c;
}
int avg(){
     return (a+b+c)/3;
}
}
public class p_155_10 {

    /**
     * @param args
     */
    public static void main(String[] args) {
        CCalculator obj=new CCalculator();
        obj.set_value(3, 4, 1);
        int x=4,y=3;
        System.out.println("x*y="+x*y);
        System.out.println("x/y="+x/y+" x/y="+(double)x/y);
        
        System.out.println("add="+obj.add()+" sub="+obj.sub()+" mul="+obj.mul()+" avg="+(double)obj.avg());//这里为何没有从int转换成double呢？
        // TODO 自动生成方法存根

    }

}