c++ - 打印变量时的 C++ 意外垃圾值

Question

这段代码：

int a[] = {};
    int i,b,o,p,j;
    std::cout<<"a[-2] >> "<<a[-2]<<std::endl;
    std::cout<<"a[-1] >> "<<a[-1]<<std::endl;
    std::cout<<"a[0] >> "<<a[0]<<std::endl;
    std::cout<<"a[1] >> "<<a[1]<<std::endl;
    std::cout<<"a[2] >> "<<a[2]<<std::endl;
    std::cout<<"b >> "<<b<<std::endl;
    std::cout<<"p >> "<<p<<std::endl;
    std::cout<<"j >> "<<j<<std::endl;
    std::cout<<"a[3] >> "<<a[3]<<std::endl;

像这样的输出..：

a[-2] >> -875679664
a[-1] >> -2
a[0] >> 7470856
a[1] >> 1993175021
.
.
j >> 7470856
a[3] >> 7470928

请帮帮我，我真的不知道

谢谢.. +++++++++++++++++++++++++++++++++++++++++++++++++++ +++++++++++++++++++