📅  最后修改于: 2020-10-17 06:32:23             🧑  作者: Mango
C++ bitset test()函数用于测试位置p处的位是否已设置。如果位设置在位置p,则返回true或false。
bool test(int p);
p:采用一个参数,并指定是否设置该位的索引。
如果设置了位置p的位,则返回true;否则,返回false。
#include
#include
using namespace std;
int main()
{
bitset<8> b(string("01010110"));
bool a=b.test(3);
bool c=b.test(2);
cout << " bitset b is set at position 3 : " << a <<'\n';
cout << " bitset b is set at position 2 : " << c <<'\n';
return 0;
}
输出:
bitset b is set at position 3 : 0
bitset b is set at position 2 : 1
#include
#include
using namespace std;
int main()
{
bitset<8> b(string("01010110"));
bitset<4> b1;
cout << " bitset b is set at position 3 : " << b.test(3) <<'\n';
cout << " bitset b1 is set at position 2 : " << b.test(2) <<'\n';
return 0;
}
输出:
bitset b is set at position 3 : 0
bitset b1 is set at position 2 : 1
#include
#include
using namespace std;
int main()
{
bitset<8> b(string("01010110"));
if(b.test(1)){
cout << "bitset is set at postion 1";
}
else
{
cout << "bitset is not set at position 1";
}
return 0;
}
输出:
bitset is set at postion 1