比较运算符

代码示例

1<变量类型> <操作符> <变量名>

1#include <iostream>
2using namespace std;
3
4int main() {
5  int a, b, c;
6  a = 1;
7  b = 1;
8  c = 0;
9
10  cout << "A = " << a << ", B = " << b << ", C = " << c << endl; 
11  // 等于
12  cout << "A == B: " << (a == b) << endl;
13  cout << "A != C: " << (a != c) << endl;
14  // 大于、小于
15  cout << "A > C : " << (a > c) << endl;
16  cout << "A <= C: " << (a <= c) << endl;
17  // 与
18  cout << "A AND B: " << (a && b) << endl;
19  cout << "A AND C: " << (a && c) << endl;
20  // 或
21  cout << "A OR B: " << (a || b) << endl;
22  cout << "A OR C: " << (a || c) << endl;
23  // 非
24  cout << "NOT C: " << !c << endl;
25  return 0;
26}

表格

1#include <iostream>
2#include <iomanip>
3using namespace std;
4
5int main() {
6    double a = 0.3;
7    double b = 0.1 + 0.2;
8    // 比较浮点数和双精度数是否相等
9    cout << "a 是 " << a << ", b 是 " << b << "，(a == b) 的结果为 " << (a==b) << endl;
10    cout << "如果将精度设置为17位，a 和 b 的值变为：" << endl;
11    cout << setprecision(17);
12    cout << "a = " << a << endl << "b = " << b;
13    return 0;
14}

匹配答案

1true || false && false