C++ STL中的bitset none()

bitset :: none()是C++中的内置STL，如果未设置任何位，则返回True。如果至少设置了一位，则返回False。

句法：

bool none() 

参数：该函数接受任何参数。

返回值：该函数返回一个布尔值。如果未设置任何布尔值，则布尔值为True 。如果至少设置了一位，则为False 。

下面的程序说明了bitset :: none()函数。

程序1：

C++

// C++ program to illustrate the
// bitset::none() function
#include 
using namespace std;
 
int main()
{
 
    // initialization of bitset
    bitset<4> b1(string("1100"));
    bitset<6> b2(string("000000"));
 
    // Function to check if none of
    // the bits are set or not in b1
    bool result1 = b1.none();
    if (result1)
        cout << b1 << " has no bits set"
             << endl;
    else
        cout << b1 << " has a minimum of one bit set"
             << endl;
 
    // Function to check if none of
    // the bits are set or not in b1
    bool result2 = b2.none();
    if (result2)
        cout << b2 << " has no bits set"
             << endl;
    else
        cout << b2 << " has a minimum of one bit set"
             << endl;
 
    return 0;
}

输出：

1100 has a minimum of one bit set
000000 has no bits set

程式2：

C++

// C++ program to illustrate the
// bitset::none() function
// when the input is a number
#include 
using namespace std;
 
int main()
{
    // initialization of bitset
    bitset<3> b1(4);
    bitset<6> b2(0);
 
    // Function to check if none of
    // the bits are set or not in b1
    bool result1 = b1.none();
    if (result1)
        cout << b1 << " has no bits set"
             << endl;
    else
        cout << b1 << " has a minimum of one bit set"
             << endl;
 
    // Function to check if none of
    // the bits are set or not in b1
    bool result2 = b2.none();
    if (result2)
        cout << b2 << " has no bits set"
             << endl;
    else
        cout << b2 << " has a minimum of one bit set"
             << endl;
 
    return 0;
}

输出：

100 has a minimum of one bit set
000000 has no bits set

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