C++ STL中的bitset all()函数

bitset :: all()是C++ STL中的内置函数，如果所有位都以数字的二进制表示形式设置(如果在位集中进行了初始化)，则该函数将返回True。如果未设置所有位，则返回False。

句法：

bool bitset_name.all() 

参数：此函数不接受任何参数。

返回值：该函数返回一个布尔值。如果所有位均已设置，则返回的布尔值是true，否则返回false，

下面的程序说明了bitset :: all()函数。

程序1：

// CPP program to illustrate the
// bitset::all() function
#include 
using namespace std;
  
int main()
{
    // Initialization of bitset
    bitset<4> b1(string("1100"));
    bitset<6> b2(string("111111"));
  
    // Function that checks if all
    // the bits are set or not
    bool result1 = b1.all();
    if (result1)
        cout << b1 << " has all bits set"
             << endl;
    else
        cout << b1 << " does not have all bits set"
             << endl;
  
    // Function that checks if all
    // the bits are set or not
    bool result2 = b2.all();
    if (result2)
        cout << b2 << " has all bits set"
             << endl;
    else
        cout << b2 << " does not have all bits set"
             << endl;
  
    return 0;
}

输出：

1100 does not have all bits set
111111 has all bits set

程式2：

// CPP program to illustrate the
// bitset::all() function
// when the input is as a number
  
#include 
using namespace std;
  
int main()
{
    // Initialization of bitset
    bitset<2> b1(3);
    bitset<3> b2(5);
  
    // Function that checks if all
    // the bits are set or not
    bool result1 = b1.all();
    if (result1)
        cout << b1 << " has all bits set"
             << endl;
    else
        cout << b1 << " does not have all bits set"
             << endl;
  
    // Function that checks if all
    // the bits are set or not
    bool result2 = b2.all();
    if (result2)
        cout << b2 << " has all bits set"
             << endl;
    else
        cout << b2 << " does not have all bits set"
             << endl;
  
    return 0;
}

输出：

11 has all bits set
101 does not have all bits set

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