🔥 #4 javascript(자료형, 연산자 연습)

🔥 문제 1

let a = 1;
let b = 2;
console.log(a, b);

let temp = a;
a = b;
b = temp;

console.log(a, b);

🔥 문제 2

 -----------------20 + 30 = 50
     let a = 20;
     let b = 30;
     let c;
     c = a + b;
     console.log(c);

 -----------------“20” + “30” = 2030
     let a = "20";
     let b = "30";
     let c;
     c = a + b;
     console.log(c)

 -----------------“Hello” + " " + 2021 = Hello 2021
     let a = "Hello";
     let b = " ";
     let c = 2021;
     let d;
     d = a + b + c;
     console.log(d)

 ---------------1 + 2 * 3 = 7
     let a = 1;
     let b = 2;
     let c = 3;
     let d;
     d = a + b * c;
     console.log(d);

----------(2 + 2) ** 2 = 16 ❌4*4= 16
     let a = 2;
     let b = 2;
     let c = 2;
     let d;
     d = (a + b) ** c;
     console.log(d);

 -----------1 / 0 = Infinity
     let a = 1;
     let b = 0;
     let c = a / b;
     console.log(c);

 -------------6 % 2 = 0
     let a = 6;
     let b = 2;
     let c = a % b;
     console.log(c);

 -------------7.5 % 2 = 1.5
     let a = 7.5;
     let b = 2;
     let c = a % b;
     console.log(c);

 -------------5 == 5 = true
     let a = 5;
     let b = 5;
     let c = a == b;
     console.log(c);

 -------------5 === 5 = true
     let a = 5;
     let b = 5;
     let c = a === b;
     console.log(c);

 -------------5 == “5” = ture
     let a = 5;
     let b = "5";
     let c = a == b;
     console.log(c);

 -------------5 === “5” = false
     let a = 5;
     let b = "5";
     let c = a === b;
     console.log(c);

 -------------5 != 5.0 = false
     let a = 5;
     let b = 5.0;
     let c = a != b;
     console.log(c);

 -------------5 !== 5.0 = false
     let a = 5;
     let b = 5.0;
     let c = a !== b;
     console.log(c);

 -------------“true” === true = false
     let a = "true";
     let b = true;
     let c = a === b;
     console.log(c);

 -------------5 <= 5.0 = true
     let a = 5;
     let b = 5.0;
     let c = a <= b;
     console.log(c);

 -------------5 >= 5 = true
     let a = 5;
     let b = 5.0;
     let c = a >= b;
     console.log(c);

 -------------true || true = true
     let a = true;
     let b = true;
     let c = a || b;
     console.log(c);

 -------------true || false = true
     let a = true;
     let b = false;
     let c = a || b;
     console.log(c);

 -------------true && true = true
     let a = true;
     let b = true;
     let c = a && b;
     console.log(c);

 -------------true && false = false
     let a = true;
     let b = false;
     let c = a && b;
     console.log(c);

 -------------!true = false
    let a = !true;
    console.log(a);

-------------!false = true
let a = !false;
console.log(a);