Javascript

{
    //true, false, 1, "1", 0, "0", null, undefined, [], {}
    if(true){
        document.write("실행되었습니다.(true)");
    } else{
        document.write("실행되었습니다.(false)");
    }
}

{
    const num = 100;

    if (num == 100) document.write("실행되었습니다.(true)");
    else document.write("실행되었습니다.(false)");
}

{
    const num = 100;

    if(num == 90){
        document.write("실행되었습니다.(num==90)")
    } else if (num == 100) {
        document.write("실행되었습니다.(num==100)")
    } else if (num == 110) {
        document.write("실행되었습니다.(num==110)")                    
    } else if (num == 120) {
        document.write("실행되었습니다.(num==120)")
     }else {
        document.write("실행되었습니다.(num==값이없음)")
    } 
}

{
    const num = 100;

    if (num=100){
        document.write("실행되었습니다(1)");
        if(num ==100){
            document.write("실행되었습니다(2)");
                if(num ==100){
                document.write("실행되었습니다(3)");
            }
        }
    } else {
        document.write("실행되었습니다(4)");
    }
}

{
    const num = 100;

    //if(num == 100){
    //    document.write("true");
    //} else {
    //    document.write("false");
    //}

(num == 100) ? document.write("true") : document.write("false");
}

{
    const num = 100;

    switch(num){
        case 100 :
            document.write("실행되었습니다(num==100)");
            break;
        case 200 :
            document.write("실행되었습니다(num==200)");
            break;
        case 300 :
            document.write("실행되었습니다(num==300)");
            break;
        default :
            document.write("실행되었습니다(num==값이없음)");
            break;
    }
}

{
    let num = 1;

    while(num <= 5){
        document.write(num + ".실행되었습니다.");
        num++;
    }
}

{
    let num = 1;

    do {
        document.write(num + ".실행되었습니다.");
        num++;
    } while (num <=5);
}

{
    for(let i=1; 1<=5; i++){
        document.write(i + ".실행되었습니다.");
    }
}

{
    for(let i=1; i<=2; i++){
        document.write(i + ".실행(i)되었습니다.");
        for(let j=1; j<=3; j++){
            document.write(j + ".실행(j)되었습니다.");
        }
    }
}

{
    let num = 0;               
    while (num <=20);{
        document.write(num);
        if(num == 10){
            break;
        }
        num++;
    }
    for(let i=1; i<=20; i++){
        document.write(i);
        if(i == 10){
            break;
        }
    }
}

{
    let num = 0;
    while(num < 10){
        num++;
        if ( num == 5){
            continue;
        }
        document.write(num);
    }

    for(let i=1; i<=10; i++){
        if ( i == 5){
        continue;
        }   
        document.write(i);
    }
}