Question

my @num = $line =~ /(\d+)/g;

输出： 长和长的长变量产生完全相同的最大值，我不知道为什么。 long值应该输出最大值2147483647。

#include <iostream>
using namespace std;
#include <climits>

int main () {

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

    cout << "int is " << sizeof (int) << " bytes." << endl;
    cout << "short is " << sizeof n_short << " bytes." << endl;
    cout << "long is " << sizeof n_long << " bytes." << 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 << "llong: " << n_llong << endl << endl;
    //cout << endl;

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

    return 0;
}

Answer 1

long不保证是32位长;它只需至少 32位长。您的实现已将long定义为64位。请注意，即使long和long long在您的实现上具有相同的范围，但它们仍然是不同的类型。

为什么long和long long的最大值产生相同的输出？

1 个答案: