/*script for perfect numbers page */ function integer_check() // { var a = eval(document.form1.Value1.value); if (a!=Math.floor(a)) {document.form1.Value1a.value = "Not a whole number; please enter an integer!!";} else {factorsum()} } //......................................... /* This version empties the first, third, fifth ...form values. So it doesn't delete the labels on the buttons! (Assuming there is a text box, then a button etc) function empty_the_boxes() { var loops=document.form1.length; //alert(loops); for (i=0;i<(loops-2);i++) {document.form1[i].value="";} } */ function empty_boxes() { document.form1.Value1.value=""; document.form1.Value1a.value=""; document.form2.Value2.value=""; document.form3.Value3.value=""; } //......................................... /* //This is a handy testing function function rxarray() { var rx= new Array(); rx[0]=/Tim/; return rx } .......................................*/ function test() //works; just puts the value in the first box into the second { var a = eval(document.form1.Value1.value); document.form1.Value1a.value = a; } function factorsum() // this function calculates the factor sum of the number, a. { var a = eval(document.form1.Value1.value) ; var b =""; var k = 0; var facsum = 0 factors = new Array(1); for (i = 1; i <= (Math.sqrt(a)); i++) {// am going to add the factors in the array as they are generated b=a/i; if ((b==Math.floor(b)) && (b!=i)) {factors[k]=i; factors[k+1]=b; facsum=facsum + factors[k] + factors[k+1]; k=k+2; }; if (b==i) //ie if 'a' is a square number {factors[k]=i; facsum=facsum + factors[k] k=k+1; }; } function perfect_test() //checks whether 'facsum' is twice 'a' { if (2*a == facsum) {document.form3.Value3.value = "A perfect number!!";} else {document.form3.Value3.value = "Not perfect";} } test(); perfect_test(); document.form2.Value2.value = facsum; writetable(factors,k) } function writetable(factors,k) { // get the reference for the body var body = document.getElementsByTagName("body")[0]; // creates a element and a element var tbl = document.createElement("table"); var tblBody = document.createElement("tbody"); // creating all cells for (var j = 0; j < k; j=j+2) { // creates a table row var row = document.createElement("tr"); for (var i = 0; i < 2; i++) { // Create a in the

element and a text node, make the text // node the contents of the

, and put the

at // the end of the table row var cell = document.createElement("td"); var cellText = document.createTextNode(factors[j+i]); cell.appendChild(cellText); row.appendChild(cell); } // add the row to the end of the table body tblBody.appendChild(row); } // put the

tbl.appendChild(tblBody); // appends

into body.appendChild(tbl); // sets the border attribute of tbl to 2; tbl.setAttribute("border", "2"); } /* ---------------------------------------------- */