function NPVHelp(form) {
alert("This feature is not yet implemented.");
}
function randomNPVProblem(form) {
theCF0 = -1000 - (Math.round(Math.random()*2)*100);
theCF1 = ((Math.round(Math.random()*5)) + 1)*100;
theCF2 = ((Math.round(Math.random()*5)) + 1)*100;
theCF3 = ((Math.round(Math.random()*5)) + 1)*100;
theCF4 = ((Math.round(Math.random()*5)) + 1)*100;
theCF5 = ((Math.round(Math.random()*5)) + 1)*100;
theRate = ((Math.round(Math.random()*1500)) + 100)/100;
form.Year0.value="" + theCF0;
form.Year1.value="" + theCF1;
form.Year2.value="" + theCF2;
form.Year3.value="" + theCF3;
form.Year4.value="" + theCF4;
form.Year5.value="" + theCF5;
form.RateInput.value="" + theRate;
form.NPVOutput.value="";
}
function findNPV(form) {
theCF0Str = form.Year0.value;
if (!isNegativeNumber(theCF0Str)) {
return false;
}
theCF1Str = form.Year1.value;
if (!isPositiveNumber(theCF1Str)) {
return false;
}
theCF2Str = form.Year2.value;
if (!isPositiveNumber(theCF2Str)) {
return false;
}
theCF3Str = form.Year3.value;
if (!isPositiveNumber(theCF3Str)) {
return false;
}
theCF4Str = form.Year4.value;
if (!isPositiveNumber(theCF4Str)) {
return false;
}
theCF5Str = form.Year5.value;
if (!isPositiveNumber(theCF5Str)) {
return false;
}
theRateStr = form.RateInput.value;
if (!isPositiveNumber(theRateStr)) {
return false;
}
theCF0 = parseFloat(theCF0Str);
theCF1 = parseFloat(theCF1Str);
theCF2 = parseFloat(theCF2Str);
theCF3 = parseFloat(theCF3Str);
theCF4 = parseFloat(theCF4Str);
theCF5 = parseFloat(theCF5Str);
theRate = parseFloat(theRateStr);
var theNPV = theCF0;
theNPV += theCF1/(1 + theRate/100);
theNPV += theCF2/Math.pow(1 + theRate/100,2);
theNPV += theCF3/Math.pow(1 + theRate/100,3);
theNPV += theCF4/Math.pow(1 + theRate/100,4);
theNPV += theCF5/Math.pow(1 + theRate/100,5);
form.NPVOutput.value = "" + Math.round(theNPV*100)/100;
return true;
}
function calcNPVHelp(form) {
theCF0Str = form.Year0.value;
if (!isNegativeNumber(theCF0Str)) {
return false;
}
theCF1Str = form.Year1.value;
if (!isPositiveNumber(theCF1Str)) {
return false;
}
theCF2Str = form.Year2.value;
if (!isPositiveNumber(theCF2Str)) {
return false;
}
theCF3Str = form.Year3.value;
if (!isPositiveNumber(theCF3Str)) {
return false;
}
theCF4Str = form.Year4.value;
if (!isPositiveNumber(theCF4Str)) {
return false;
}
theCF5Str = form.Year5.value;
if (!isPositiveNumber(theCF5Str)) {
return false;
}
theRateStr = form.RateInput.value;
if (!isPositiveNumber(theRateStr)) {
return false;
}
theCF = new Array(6);
theCF2 = new Array(6);
theF = new Array(6);
theCF[0] = parseFloat(theCF0Str);
theCF[1] = parseFloat(theCF1Str);
theCF[2] = parseFloat(theCF2Str);
theCF[3] = parseFloat(theCF3Str);
theCF[4] = parseFloat(theCF4Str);
theCF[5] = parseFloat(theCF5Str);
theRate = parseFloat(theRateStr);
var theNPV = theCF[0];
var theNum = 0;
var theCNT = 1;
for (i = 1; i <= 5; i++) {
theNPV += theCF[i]/Math.pow(1 + theRate/100,i);
if (i > 1) {
if (theCF[i] == theCF[i-1]) {
theCF2[theCNT] = theCF[i];
theF[theCNT]++;
} else {
theCNT++;
theCF2[theCNT] = theCF[i];
theF[theCNT] = 1;
}
} else {
theCF2[theCNT] = theCF[i];
theF[theCNT] = 1;
}
}
theNPV = "" + Math.round(theNPV*100)/100;
var theOut = "NPV Help";
theOut += "NPV Help
";
theOut += "To solve using the Texas Instruments BA II Plus Calculator:
";
theOut += "| [CF] | [2nd][CLR WORK] |
";
theOut +="| " + theCF[0] + " | [Enter][Down Arrow] |
";
for (i=1; i<=theCNT; i++) {
theOut +="| " + theCF2[i] + " | [Enter][Down Arrow] |
";
theOut +="| " + theF[i] + " | [Enter][Down Arrow] |
";
}
theOut +="| [NPV] | |
";
theOut +="| " + theRateStr + " | [CPT] |
";
theOut += "The NPV is $" + theNPV + "
";
theOut += "";
theOut += "";
theOut += "";
var newWin = window.open("","","scrollbars,resizable,width=400,height=420");
if (newWin != null) {
newWin.document.write(theOut);
newWin.document.close();
newWin.focus();
}
return true;
}
function isPositiveNumber(inputStr) {
for (var i = 0; i < inputStr.length; i++) {
var oneChar = inputStr.substring(i,i+1);
if (((oneChar >= "0") && (oneChar <= "9")) || (oneChar == ".")) {
} else {
alert("Please make sure that only numbers are input.");
return false;
}
}
return true;
}
function isNegativeNumber(inputStr) {
if (inputStr.length < 2) {
alert("Please input a negative number.");
return false;
}
var oneChar = inputStr.substring(0,1);
if (oneChar != '-') {
alert("Please make sure that only negative numbers are input.");
return false;
}
for (var i = 1; i < inputStr.length; i++) {
oneChar = inputStr.substring(i,i+1);
if (((oneChar >= "0") && (oneChar <= "9")) || (oneChar == ".")) {
} else {
alert("Please make sure that only numbers are input.");
return false;
}
}
return true;
}