Simple if else program
<html>
<head></head>
<body>
<script>
var num=prompt("Give me a number: ");
if(num>0){
document.write(num," > 0");
} else {
document.write(num," <= 0");
}
</script> </body> </html>
If..else if..else program
<html>
<head></head>
<body>
<script>
var nm=prompt("Give me your name: ");
var age=prompt("Give me your age: ");
var waitYears = 0 ;
if(age<18){
waitYears=18-age;
document.write(nm," wait ",waitYears," to vote.")
} else if(age>18){
waitYears=age-18;
document.write(nm," you vote since ",waitYears," years.");
} else {
document.write(nm," nice first vote.");
};
</script>
</body>
</html>
Switch structure
<html>
<head></head>
<body>
<script>
var num=prompt("Give me a number: ");
if(num>0){
document.write(num," > 0");
} else {
document.write(num," <= 0");
}
</script> </body> </html>
If..else if..else program
<html>
<head></head>
<body>
<script>
var nm=prompt("Give me your name: ");
var age=prompt("Give me your age: ");
var waitYears = 0 ;
if(age<18){
waitYears=18-age;
document.write(nm," wait ",waitYears," to vote.")
} else if(age>18){
waitYears=age-18;
document.write(nm," you vote since ",waitYears," years.");
} else {
document.write(nm," nice first vote.");
};
</script>
</body>
</html>
Switch structure
<html>
<head></head>
<body>
<script>
var num=prompt("Give me a number 1-5: ");
switch (num){
case '1':
document.write("one");break;
case '2':
document.write("two");break;
case '3':
document.write("three");break;
case '4':
document.write("four");break;
case '5':
document.write("five");break;
default:
document.write("Uknown number.");
}
</script> </body> </html>
</script> </body> </html>
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