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。
test - 语法
bool test(int p);
test - 参数
p :指定是否设置该位的索引。
test - 返回值
如果设置了位置p的位，则返回true；否则，返回false。
test - 例子1
#include <iostream> #include <bitset> 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 << ; cout << " bitset b is set at position 2 : " << c << ; return 0; }
输出:
bitset b is set at position 3 : 0 bitset b is set at position 2 : 1
test - 例子2
#include <iostream> #include <bitset> using namespace std; int main() { bitset<8> b(string("01010110")); bitset<4> b1; cout << " bitset b is set at position 3 : " << b.test(3) << ; cout << " bitset b1 is set at position 2 : " << b.test(2) << ; return 0; }
输出:
bitset b is set at position 3 : 0 bitset b1 is set at position 2 : 1
test - 例子3
#include <iostream> #include <bitset> 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
