运算符(个人学习笔记黑马学习)

算数运算符

 加减乘除

#include <iostream>
using namespace std;int main() {int a1 = 10;int a2 = 20;cout << a1 + a2 << endl;cout << a1 - a2 << endl;cout << a1 * a2 << endl;cout << a1 / a2 << endl;/*double a3 = 0.5;double a4 = 0.25;cout << a3 / a4 << endl;*/double a3 = 0.5;double a4 = 0.22;cout << a3 / a4 << endl;//运算结果也可以是小数system("pause");return 0;
}

---

取模  

#include <iostream>
using namespace std;int main() {int a1 = 10;int b1 = 3;cout << a1 % b1 << endl;/*两个小数之间不可以做取余运算double d1 = 0.2;double d2 = 0.55;count << d1 % d2 << endl;*/system("pause");return 0;
}

---

自增自减 

#include <iostream>
using namespace std;int main() {//前置int a2 = 10;int b2 = ++a2 * 10;cout << "a2 = " << a2 << endl;cout << "b2 = " << b2 << endl;//后置int a3 = 10;int b3 = a3++ * 10;cout << "a3 =" << a3 << endl;cout << "b3 =" << b3 << endl;system("pause");return 0;
}

  

---

赋值运算符

#include <iostream>
using namespace std;int main() {// =int a = 10;a = 100;cout << "a=" << a << endl;// +=a = 10;a += 2;cout << "a=" << a << endl;// -=a = 10;a -= 2;cout << "a=" << a << endl;// *=a = 10;a *= 2;cout << "a=" << a << endl;// /=         a = 10;a /= 2;cout << "a=" << a << endl;// %=a = 10;a %= 2;cout << "a=" << a << endl;system("pause");return 0;
}

---

比较运算符 

#include <iostream>
using namespace std;int main() {//==int a = 10;int b = 20;cout << (a == b) << endl;//!=cout << (a != b) << endl;//>cout << (a > b) << endl;//<cout << (a < b) << endl;//>=cout << (a >= b) << endl;//<=cout << (a <= b) << endl;system("pause");return 0;
}

---

逻辑运算符 

逻辑非！

#include <iostream>
using namespace std;int main() {int a = 10;cout << !a << endl;cout << !!a << endl;system("pause");return 0;
}

---

逻辑与&& 

#include <iostream>
using namespace std;int main() {int a = 10;int b = 10;cout << (a && b) << endl;a = 0;b = 10;cout << (a && b) << endl;a = 0;b = 0;cout << (a && b) << endl;system("pause");return 0;
}

---

逻辑或|| 

#include <iostream>
using namespace std;int main() {int a = 10;int b = 10;cout << (a || b) << endl;a = 0;b = 10;cout << (a || b) << endl;a = 0;b = 0;cout << (a || b) << endl;system("pause");return 0;
}