JAVA 기초 - 산술연산자(Arithmetic Operator)

C_Arithmetic.java

package com.kh.operator;

// 산술연산자 (+ - * / %)
public class C_Arithmetic {
	
	public void method1() {
		int num1 = 10;
		int num2 = 3;
		
		//우선순위 : (* / %) > (+ -)
		
		System.out.println("num1 + num2 = " + (num1+num2));
		System.out.println("num1 - num2 = " + (num1-num2));
		System.out.println("num1 * num2 = " + num1*num2);
		System.out.println("num1 / num2 = " + num1/num2);
		System.out.println("num1 % num2 = " + num1 % num2);
	}
	public void method2() {
		int a = 5;
		int b = 10;
		int c = (++a) + b; // a=6, b=10, c=16
		int d = c / a; // a=6, b=10, c=16, d=2
		int e = c % a; // a=6, b=10, c=16, d=2 e=4
		int f = e++; // a=6, b=10, c=16, d=2 e=4(5) f=4
		int g = (--b) + (d--); //a=6, b=9, c=16 d=2(1) e=5 f=4 g=11
		int h = 2; // a=6, b=9, c=16 d=2(1) e=5 f=4 g=11 h=2
		int i = a++ + b / (--c / f) * (g-- - d) % (++e + h); //a=6(7), b=9, c=15, d=1 e=6 f=4 g=11(10) h=2 i=
		        // 6 + 9 /    3     *    10     %     8
				// 6 +   3          *    10     %     8
		        // 6 +            30            %     8
		        //  12
		
		// a=7, b=9, c=15, d=1, e=6, f=4, g=10, h=2, i=12
		System.out.println("a : " + a);
		System.out.println("b : " + b);
		System.out.println("c : " + c);
		System.out.println("d : " + d);
		System.out.println("e : " + e);
		System.out.println("f : " + f);
		System.out.println("g : " + g);
		System.out.println("h : " + h);
		System.out.println("i : " + i);
		
	}
}

 Point

- 후증감되는게 헷갈릴 수 있으니 주의 처리숫자 옆에 ()로 숫자 넣어 주기 ex. a=3(4)