一元运算符

package unary_operator;

import org.junit.Test;

/*一元运算符：前++ 后++*/
public class UnaryOperatorTest {

    @Test
    public void test() {

        int i = 3;
        //i=3 4 5
        int k = (i++) + (i++) + (i++);
        System.out.println(k);//12

        i=3;
        //i=4 5 6
        k = (++i) + (++i) + (++i);
        System.out.println(k);//15

        i = 1;
        //i=1 3 3 1
        k = (i++) + (++i) + (i--) + (--i);
        System.out.println(k);//8
    }
    @Test
    public void test1() {
        int n=1,m=1;
        int sum = (n++)+(++n)+(m++)+(++m)+
                (n++)+(++m)+(n++)+(n++);
        //n=1 n=3 n=3 n=4 n=5
        //m=1 m=3 m=4
        System.out.println(sum);
    }

    @Test
    public void test2(){
        int n=0,m=0,k=0,j=0;
        k = n++; //k==0 n=1
        ++n;//n=2
        ++m;//m=1
        n++;//n=3
        --n;//n=2
        m++;//m=2
        --m;//m=1
        m++;//m=2
        //m=2 2 3
        //n=3 3 4
        //j=7+10=17
        j=(m++)+(++n)+(--m)+(++m)+(n++)+(n++);
        System.out.println(m);
        System.out.println(n);
        System.out.println(k);
        System.out.println(j);
    }
    @Test
    public void test3(){
        int m=0,n=0;
        //m=1 2 2 2 2 4 4 6 6 8
        System.out.println((++m)+(++m)
        +(m--)+(++m)+(m++)+(++m)
                +(m++)+(++m)+(m++)+(++m));//37
        //n=0 2 2
        //m=7
        System.out.println((n++)+(--m)
                +(++n)+(n++));//11

        System.out.println(n);//3

        System.out.println(m);//7
    }
}