程序清单3.2 exceed.cpp

// exceed.cpp -- exceeding some integer limits
#include <iostream>
#define ZERO 0
#include <climits>

int main()
{
    using namespace std;
    short sam = SHRT_MAX;
    unsigned short sue = sam;

    cout << "Sam has " << sam << "dollars and Sue has " << sue;
    cout << " dollars deposited." << endl
         << "Add $1 to each account." << endl << "Now ";
    sam = sam + 1;
    sue = sue + 1;
    cout << "Sam has " << sam << " dollars and Sue has " << sue;
    cout << " dollars deposited.\nPoor Sam!!" << endl;

    sam = ZERO;
    sue = ZERO;
    cout << "Sam has " << sam << " dollars and Sue has " << sue;
    cout << " dollars deposited." << endl
         << "Take $1 from each account." << endl << "Now ";

    sam = sam - 1;
    sue = sue - 1;

    cout << "Sam has " << sam << " dollars and Sue has " << sue;
    cout << " dollars deposited.\nLucky Sue!!" << endl;

    return 0;

}

输出：

Sam has 32767dollars and Sue has 32767 dollars deposited.
Add $1 to each account.
Now Sam has -32768 dollars and Sue has 32768 dollars deposited.
Poor Sam!!
Sam has 0 dollars and Sue has 0 dollars deposited.
Take $1 from each account.
Now Sam has -1 dollars and Sue has 65535 dollars deposited.
Lucky Sue!!