Example of small programs with forms, function, field-input, field-output and a complex calculation

Here you see 6 examples of calculations. Most of the calculations are fuctions about recursion. One is about the calculation of a sinus.

<HTML>
<HEAD>
<TITLE>......</TITLE>
<HEAD>

<SCRIPT>
function  fac (n)
{ 
 var y;
 if ((n==0) || (n==1)) return 1
 else { y=( n*fac(n-1) ); return y }
}

function  facAltn(n)
{ 
 var y,j; 
 y=n;
 for (j=n-1; j>1; j--) y=y*j;
 return y
}

function  facultA (form)
{ 
 var z;
 i=document.form8.p1.value;
 document.form11.p.value = fac (i);
}

function  facultB (form)
{ 
 var z;
 i = document.form8.p1.value;
 document.form11.q.value = facAltn (i);
}

function  function11 (form)
{
 document.form11.r.value = fac (document.form8.p1.value);
}

function  function12 (form)
{ 
 var z;
 i = document.form8.p1.value;
 with (Math) document.form11.s.value = sin (i);
}
</SCRIPT>

<BODY>
xxxx<BR>
xxxx<BR>
xxxx<BR>
<FORM NAME="form8">
<INPUT TYPE="TEXT" NAME="p1" VALUE="29" SIZE="10">
</FORM>
xxxx<BR>
xxxx<BR>
<FORM NAME="form11">
<INPUT TYPE="button" VALUE="facult A" ONCLICK="facultA (this.form)">
<INPUT TYPE="TEXT" NAME="p" VALUE="aaa" SIZE="30">
<BR>
<INPUT TYPE="button" VALUE="facult B" ONCLICK="facultB (this.form)">
<INPUT TYPE="TEXT" NAME="q" VALUE="bbb" SIZE="30">
<BR>
<INPUT TYPE="button" VALUE="facult C" ONCLICK="function11 (this.form)">
<INPUT TYPE="TEXT" NAME="r" VALUE="ccc" SIZE="30">
<BR>
<INPUT TYPE="button" VALUE="sinus" ONCLICK="function12 (this.form)">
<INPUT TYPE="TEXT" NAME="s" VALUE="ddd" SIZE="30">
</FORM>
xxxx<BR>
xxxx<BR>
xxxx<BR>
</BODY>
</HTML>

Results:

xxxx
xxxx
xxxx
xxxx
xxxx
xxxx
xxxx
xxxx

Comments:

Do you see the difference between them?

The function 'function11' and 'facultA' needs the function 'fac'. The function 'facultB' needs 'facAltn'. We call them 'nested fuctions'.

Remarks:

If you see numbers as 1.1240007277776077e+21 than you have to know that that is 1.124 x 10 ²¹. We call that the e-way of notation of a broken value.

Enschede, 9 januari 2001