bitset :: count()是C++中的内置STL,它以数字的二进制表示形式返回设置的位数。
句法:
int count()
参数:该函数接受任何参数。
返回值:该函数返回设置的位数。如果传递的数字是整数,则以数字的二进制表示形式返回1的总数或设置位数。
下面的程序说明了bitset :: count()函数。
程序1:
// CPP program to illustrate the
// bitset::count() function
#include
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\n";
// 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
程式2:
// CPP program to illustrate the
// bitset::count() function
// when the input is an integer
#include
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\n";
// 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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