C++ STL中的位集计数()

比特集::计数() 是C++中内置的STL,它返回一个数字二进制表示中的设置位数。

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语法:

int count() 

参数: 该函数不接受任何参数。

返回值: 该函数返回设置位数。如果传递的数字是整数,则返回数字的二进制表示形式中的总位数或设置位数。

下面的程序演示了bitset::count()函数。

项目1:

// CPP program to illustrate the
// bitset::count() function
#include <bits/stdc++.h>
using namespace std;
int main()
{
// Initialisation of a bitset
bitset<4> b1(string( "1100" ));
bitset<6> b2(string( "001000" ));
// Function to count the
// number of set bits in b1
int result1 = b1.count();
cout << b1 << " has " << result1
<< " set bit" ;
// Function to count the
// number of set bits in b2
int result2 = b2.count();
cout << b2 << " has " << result2
<< " set bit" ;
return 0;
}


输出:

1100 has 2 set bit
001000 has 1 set bit

项目2:

// CPP program to illustrate the
// bitset::count() function
// when the input is an integer
#include <bits/stdc++.h>
using namespace std;
int main()
{
// Initialisation of a bitset
bitset<4> b1(16);
bitset<4> b2(18);
// Function to count the
// number of set bits in b1
int result1 = b1.count();
cout << b1 << " has " << result1
<< " set bit" ;
// Function to count the
// number of set bits in b2
int result2 = b2.count();
cout << b2 << " has " << result2
<< " set bit" ;
return 0;
}


输出:

0000 has 0 set bit
0010 has 1 set bit

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