<script>
document.write("자바스크립트 안녕하세요<br>");
document.write("반갑습니다")
document.write("<hr>")
a = 7;
b = 5;
document.write(a + "<br>")
document.write(a + b + "<br>")
document.write("a + b = " + (a + b) + "<br>")
sum = a + b;
document.write("sum = " + sum + "<br>")
var num1 = 100;
var num2 = 30;
add = num1 + num2;
sub = num1 - num2;
mul = num1 * num2;
div = num1 / num2;
mod = num1 % num2;
document.write("덧셈 = " + add + "<br>")
document.write("뺄셈 = " + sub + "<br>")
document.write("곱셈 = " + mul + "<br>")
document.write("나눗셈 = " + div + "<br>")
document.write("나머지 = " + mod + "<br>")
r1 = num1 <= num2;
r2 = num1 == num2;
r3 = num1 != num2;
document.write("r1 : " + r1 + "<br>")
document.write("r2 : " + r2 + "<br>")
document.write("r3 : " + r3 + "<br>")
r4 = (num1 <= num2) && (num1 >= num2);
r5 = (num1 <= num2) || (num1 >= num2);
r6 = !(num1 != num2);
document.write("r4 : " + r4 + "<br>")
document.write("r5 : " + r5 + "<br>")
document.write("r6 : " + r6 + "<br>")
var n = 10;
var m = 5;
document.write(n + "<br>");
document.write(n++ + "<br>");
document.write(n + "<br>");
document.write(++n + "<br>");
document.write(n-- + "<br><br>");
document.write(n + "<br>");
document.write(--n + "<br>");
document.write(n++ + m++ + "<br><br>");
document.write(n + "<br>");
document.write(m + "<br>");
document.write(++n + ++m + "<br><br>");
document.write(n + "<br>");
document.write(m + "<br>");
document.write(--n + m-- + "<br>");
document.write(n + "<br>");
document.write(m + "<br>");
</script>