Introduction to Javascript (Warm-Up)

Introduction to JavaScript (warm-up)

Program #1 Addition

<html>

<head>

<title>An Addition Program</title>

var firstNumber,

secondNumber,

number1,

number2,

sum;

firstNumber =

window.prompt( "Enter first integer", "0" );

secondNumber =

window.prompt( "Enter second integer", "0" );

number1 = parseInt( firstNumber );

number2 = parseInt( secondNumber );

sum = number1 + number2;

document.writeln( "<h1>The sum is " + sum + "</h1>" );

</script>

</head>

<body>

<p>Click Refresh (or Reload) to run the script again</p>

</body>

</html>

Program #2

<html>

<head>

<title>Performing Comparisons</title>

var first,

second,

number1,

number2;

first = window.prompt( "Enter first integer:", "0" );

second = window.prompt( "Enter second integer:", "0" );

number1 = parseInt( first );

number2 = parseInt( second );

document.writeln( "<h1<center>Comparison results</center</h1>" );

document.writeln("<table align=center border=5 width=100>" );

if ( number1 == number2 )

document.writeln( "<tr<td>" + number1 + " == " +

number2 + "</td</tr>" );

if ( number1 != number2 )

document.writeln( "<tr<td>" + number1 + " != " +

number2 + "</td</TR>" );

if ( number1 < number2 )

document.writeln( "<tr<td>" + number1 + " < " +

number2 + "</td</tr>" );

if ( number1 > number2 )

document.writeln( "<tr<td>" + number1 + " > " +

number2 + "</td</tr>" );

if ( number1 <= number2 )

document.writeln( "<tr<td>" + number1 + " <= " +

number2 + "</td</tr>" );

if ( number1 >= number2 )

document.writeln( "<tr<td>" + number1 + " >= " +

number2 + "</td</tr>" );

document.writeln( "</table>" );

</script>

</head>

<body>

<p align=center>Click Refresh (or Reload) to run the script again</p>

</body>

</html>

Program #3

<html>

<head>

<title>comparisons</title>

var number1, number2, number3,

firstNumber, secondNumber, thirdNumber,

largest, smallest;

number1 = window.prompt(

"Enter the first number", "0" );

number2 = window.prompt(

"Enter the second number", "0" );

number3 = window.prompt(

"Enter the third number", "0" );

firstNumber = parseInt ( number1 );

secondNumber = parseInt ( number2 );

thirdNumber = parseInt ( number3 );

largest = firstNumber;

smallest = firstNumber;

if ( secondNumber > largest )

largest = secondNumber;

if ( thirdNumber > largest )

largest = thirdNumber;

if ( secondNumber < smallest )

smallest = secondNumber;

if ( thirdNumber < smallest )

smallest = thirdNumber;

window.alert(

"Sum: " + ( firstNumber + secondNumber +

thirdNumber ) + "\n" + "Average: " + ( (firstNumber

+ secondNumber + thirdNumber) / 3 ) + "\n" +

"Product: " + ( firstNumber * secondNumber *

thirdNumber ) + "\n" + "Largest: " + largest +

"\n" + "Smallest: " + smallest );

// -->

</script>

</head>

<body>

<p>Click Refresh (or Reload) to run the script again</p>

</body>

</html>