//带默认 参数的函数举例
#include <iostream>
#include <iomanip>
using namespace std;

int getVolume(int length, int width=2, int height=3);

int main()
{
    const int X=10, Y=12, Z=15;
    cout<<"Some box data is";
    cout<<getVolume(X, Y, Z)<<endl;
    cout<<"Some box data is";
    cout<<getVolume(X, Y)<<endl;
    cout<<"Some box data is";
    cout<<getVolume(X)<<endl;
    return 0;
}

int getVolume(int length, int width/*=2*/, int height/*=3*/)
{
    cout<<setw(5)<<length<<setw((5)<<width<<setw(5)<<height<<'\t';
    return length * width * height;
}