程序清单3.1 limits.cpp

// limits.cpp -- some integer limits

#include <iostream>
#include <climits>  // use limits.h for older systems

int main()
{
    using namespace std;

    int n_int = INT_MAX;
    short n_short = SHRT_MAX;
    long n_long = LONG_MAX;
    long long n_llong = LLONG_MAX;

    // sizeof operator yields size of type or of variable
    cout << "int is " << sizeof(int) << " bytes." << endl;
    cout << "short is " << sizeof n_short << " bytes." << endl;
    cout << "long is " << sizeof(n_long) << " byte." << endl;
    cout << "long long is " << sizeof n_llong << " bytes." << endl;
    cout << endl;

    cout << "Maximum values:" << endl;
    cout << "int: " << n_int << endl;
    cout << "short: " << n_short << endl;
    cout << "long: " << n_long << endl;
    cout << "long long: " << n_llong << endl;

    cout << "Minimum int value = " << INT_MIN << endl;
    cout << "Bits per byte = " << CHAR_BIT << endl;

    return 0;
}

输出：

int is 4 bytes.
short is 2 bytes.
long is 8 byte.
long long is 8 bytes.

Maximum values:
int: 2147483647
short: 32767
long: 9223372036854775807
long long: 9223372036854775807
Minimum int value = -2147483648
Bits per byte = 8