在C++ STL中对any()进行位设置

bitset :: any()是C++ STL中的内置函数，如果数字中至少设置了一位，则返回True。如果未设置所有位或数字为零，则返回False。

句法：

bool any() 

参数：该函数不接受任何参数。

返回值：该函数返回一个布尔值。如果设置了布尔值的任何一位，则返回的布尔值为True 。如果未设置任何位，则为False 。

下面的程序说明了bitset :: any()函数。

程序1：

C++

// C++ program to illustrate the
// bitset::any() function
#include 
using namespace std;
 
int main()
{
    // initialization
    bitset<4> b1(string("1100"));
    bitset<6> b2(string("000000"));
 
    // function to check if any of
    // its bits are set or not
    bool result1 = b1.any();
    if (result1)
        cout << b1 << " has a minimum of one-bit set"
             << endl;
    else
        cout << b1 << " does not have any bits set"
             << endl;
 
    // function to check if any of
    // its bits are set or not
    bool result2 = b2.any();
    if (result2)
        cout << b2 << "  has a minimum of one-bit set"
             << endl;
    else
        cout << b2 << " does not have any bits set"
             << endl;
 
    return 0;
}

输出：

1100 has a minimum of one-bit set
000000 does not have any bits set

程式2：

C++

// C++ program to illustrate the
// bitset::any() function
// when the input is as a number
 
#include 
using namespace std;
 
int main()
{
    // initialization
    bitset<2> b1(3);
    bitset<3> b2(0);
 
    // function to check if any of
    // its bits are set or not
    bool result1 = b1.any();
    if (result1)
        cout << b1 << " has a minimum of one-bit set"
             << endl;
    else
        cout << b1 << " does not have any bit set"
             << endl;
 
    // function to check if any of
    // its bits are set or not
    bool result2 = b2.any();
    if (result2)
        cout << b2 << " has a minimum of one-bit set"
             << endl;
    else
        cout << b2 << " does not have any bit set"
             << endl;
 
    return 0;
}

输出：

11 has a minimum of one-bit set
000 does not have any bit set

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