for,while,do~while문 이용한 구구단 만들기

 

for 문
    <script>
     for (i=1; i <= 9; i++){
     for (j=1; j <= 9; j++){
        document.write(i+"X" + j + "="+ (i*j)+"<br>");
     }
     document.write("<hr>")
   }
</script>

do~ while 문
<script>
    var num1 = 1;
    do {
        num2 = 1;
        do {
            document.write(num1 + " * " + num2 + " = " + (num1 * num2) + "<br>");
            num2++;
        } while (num2 < 10)
        num1++;
    }  while (num1 < 10)
</script>

while문
<script>
    var num3 = 1;
while (num3 < 10){
    var num4 = 1;
while (num4 < 10){
    document.write(num3 + " * " + num4 + " = " + (num3 * num4) + "<br>");
    num4++;
}
    num3++;
    document.write("<hr>")
}
</script>