中国大学MOOC:编译并运行下面的程序，运行结果为（　）。publicclassMain{publicstaticvoidmain(String[]args){AAobj=newBB();System.out.println(obj.f(4,6));}}classAA{doublef(doublex,doubley){returnx*y;}}classBBextendsAA{doublef(doublex,doubley){returnx+y;}}

如果定义inte=8；doublef=6.4，g=8.9；，则表达式f+int(e/3*int(f+g)／2)%4的值为（）。

若有如下定义(在TurboC环境下)structdata{inti;charch;doublef;}b;则结构体变量b占用内存的字节数是().

interfaceA{doublef(doublex,doubley);}classBimplementsA{publicdoublef(doublex,doubley){returnx*y;}intg(inta,intb){returna+b;}}publicclassE{publicstaticvoidmain(Stringargs[]){Aa=newB();System.out.println(a.f(3,5));//【代码1】Bb=(B)a;System.out.println(b.g(3,5));//【代码2】}}代码1输出()代码2输出()

下列程序段运行结果是()interfaceA{doublef(doublex,doubley);}classBimplementsA{publicdoublef(doublex,doubley){returnx*y;}intg(inta,intb){returna+b;}}publicclassE{publicstaticvoidmain(String[]args){Aa=newB();System.out.println(a.f(3,5));Bb=(B)a;System.out.println(b.g(3,5));}} A: 15.0,8.0 B: 15.08 C: 158 D: 815

若有函数原型：doublef(int,double);主函数中有变量定义：intx=1;doublem=1.6,n;下列主函数中对f函数的调用错误的是。 A: n=f(x,m+1); B: printf("%f",f(x+2,2.4)); C: f(x,m); D: n=f(x);