C++ STL中的bitset size()

bitset :: size()是C++中的内置STL，它返回总位数。

句法：

bitset_name.size()

参数：该函数接受任何参数。

返回值：该函数返回一个整数值，该整数值表示位数。最终，它返回初始化位集时已给出的大小。

下面的程序说明了bitset :: size()函数。

程序1：

C++

// C++ program to illustrate the
// bitset::size() function
// when input is a string
 
#include 
using namespace std;
 
int main()
{
    // initilization of the bitset string
    bitset<4> b1(string("1100"));
    bitset<6> b2(string("010010"));
 
    // prints the size i.e.,
    // the number of bits in "1100"
    cout << "The number of bits in " << b1
         << " is " << b1.size() << endl;
 
    // prints the size i.e.,
    // the number of bits in  "010010"
    cout << "The number of bits in " << b2
         << " is " << b2.size() << endl;
 
    return 0;
}

输出：

The number of bits in 1100 is 4
The number of bits in 010010 is 6

程式2：

C++

// C++ program to illustrate the
// bitset::size() function
// when input is a number
 
#include 
using namespace std;
 
int main()
{
    // initilization of the bitset string
    bitset<3> b1(5);
    bitset<5> b2(17);
 
    // prints the size i.e.,
    // the number of bits in 5
    cout << "The number of bits in " << b1
         << " is " << b1.size() << endl;
 
    // prints the size i.e.,
    // the number of bits in 17
    cout << "The number of bits in "
         << b2 << " is " << b2.size() << endl;
 
    return 0;
}

输出：

The number of bits in 101 is 3
The number of bits in 10001 is 5

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