5.运算符1（+）

package Chapter;

//Operator




public class Sec2_Operator {
	public static void main(String[] args) {
		int i = 10;
		int j = 3;
		System.out.println(i+j);//13
		System.out.println(i-j);//7
		System.out.println(i*j);//30
		System.out.println(i/j);//3
		System.out.println(i%j);//1
		
		//关于++
		int k = 10;
		k++;
		System.out.println(k);//11
		
		int y = 10;
		++y;
		System.out.println(y);//11
		
		
		// ++出现在变量后：
		int a = 100;
		int b = a++;// ++出现在变量后先做赋值运算，再对变量中保存的值再+1
		System.out.println(a);//101
		System.out.println(b);//100
		
		// ++出现在变量前
		int m = 20 ;
		int n = ++m ;// ++出现在变量前先+1再进行赋值
		System.out.println(m);// 21
		System.out.println(n);// 21
		
		//变形:
		int e = 100;
		System.out.println(e++);//100
		System.out.println(e);//101
		//练习:
		int s = 100;
		System.out.println(++s);//101
		System.out.println(s);//101
		System.out.println(--s);//100
		System.out.println(s++);//100
		System.out.println(s--);//101
		System.out.println(s--);//100
		System.out.println(s--);//99
		System.out.println(s);//98
		
		
		
	}

}