C++ bitset none()用法及代码示例

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。

用法:

bool count()

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。如果未设置任何布尔值，则为True。如果至少设置了一位，则为False。

下面的程序演示了bitset::none()函数。

示例1:

// CPP program to illustrate the 
// bitset::none() function 
#include <bits/stdc++.h> 
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

示例2:

// CPP program to illustrate the 
// bitset::none() function 
// when the input is a number 
#include <bits/stdc++.h> 
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

相关用法

注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 bitset none() in C++ STL。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。