加减乘除运算

#include <iostream>
using namespace std;
int main()
{
    //加减乘除
	int a1 = 300;
	int b1 = 3;

	cout << a1 + b1 << endl;
	cout << a1 - b1 << endl;
	cout << a1 * b1 << endl; 
	cout << a1 / b1 << endl;
	cout << a1 % b1 << endl;

	int a2 = 10;
	int b2 = 20;
	cout << a2 / b2 << endl;

	//int a3 = 10;
	//int b3 = 0;
	//cout << a3 / b3 << endl;

	double d1 = 0.5;
	double d2 = 0.22;
	cout << d1 / d2 << endl;
	
}   

注:%为取余运算，可以得出小数。double为双精度浮点型