📄 底数计算器.txt

📁 这个是 Java Script特效（新）,
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<SCRIPT LANGUAGE="JavaScript">

<!-- hiding content from old browsers

// Simulate the "power of" (^) operator

/////////////////////////////////////////

function power(op1, op2) {

	var result = 1

	for (var i = 1; i <= op2; i++) {

		result *= op1

	}

	return result

}



// Simulate the div (integral division)

// operator

/////////////////////////////////////////



function div(op1, op2) {

	return Math.round(op1 / op2 - op1 % op2 / op2)

}



// Returns a digit (maximum hexadecimal)

// based on its decimal value

/////////////////////////////////////////



function getDigit(val) {

	if (val == 10) return "A"

	if (val == 11) return "B"

	if (val == 12) return "C"

	if (val == 13) return "D"

	if (val == 14) return "E"

	if (val == 15) return "F"

	return val

	// the return statement terminates the function,

	// so there is no need for else statements

}



// Returns the decimal value of a digit

// (maximum hexadecimal)

/////////////////////////////////////////



function getValue(dig) {

	if (dig == "A") return 10

	if (dig == "B") return 11

	if (dig == "C") return 12

	if (dig == "D") return 13

	if (dig == "E") return 14

	if (dig == "F") return 15

	return dig

	// the return statement terminates the function,

	// so there is no need for else statements

} 



// Convert from decimal to specified base

/////////////////////////////////////////



function toBase(num, base) {

	var newNum = (num == 0) ? "0" : ""

	while (num >= 1) {

		newNum = getDigit(num % base) + newNum

		num = div(num, base)	

	}

	return newNum

}



// Convert from specified base to decimal

/////////////////////////////////////////



function toDec(num, base) {

	if (base == 8)

		return parseInt("0" + num)

	if (base == 16)

		return parseInt("0x" + num)

	num = "" + num // convert to string by casting

	var numLength = num.length

	// the length property returns the length of a string

	var newNum = 0 // initialization 

		       // (must be 0 so the sum is not affected)

	var curDigit = ""

	var contributedValueValue = 0

	for (var i = numLength - 1; i >= 0; --i) {

		curDigit = num.charAt(i)

		contributedValue = getValue(curDigit)

		contributedValue *= power(base, numLength - (i + 1))

		newNum += parseInt(contributedValue)

	}

	return newNum		

}



// Main function that accepts input and 

// calls appropriate functions

/////////////////////////////////////////



function convert(num, base1, base2) {

	if (typeof num == "string")

		num = num.toUpperCase()

	if (base1 == base2)

		return num

	if (base1 == 10)

		return toBase(num, base2)

	if (base2 == 10)

		return toDec(num, base1)

	return toBase(toDec(num, base1), base2)

}

 

// Create a conversion table

/////////////////////////////////////////



function drawTable(lastNum) {

	with (document) {

		lastNum = parseInt(lastNum)

		write("<TABLE BORDER=3>")

		write("<TR><TD COLSPAN=8><CENTER><FONT COLOR=purple SIZE=+4>")

		write("Base Converter</FONT></CENTER></TD></TR>")

		write("<TR>")

		for (var k = 2; k <= 16; k = k + 2) {

			write("<TD><CENTER> Base " + k + " </CENTER></TD>")

		}

		write("</TR>")

		for (var i = 0; i <= lastNum; ++i) {

			write("<TR>")	

			for (var j = 2; j <= 16; j = j + 2) {

				write("<TD>" + toBase(i, j) + "</TD>")

			}

			write("</TR>")

		}

		write("</TABLE>")

	}

}	



// Gets table's input

/////////////////////////////////////////



function getTableAttributes() {

	var message = "Enter last number to be converted in the table"

	var lastNum = parseInt(prompt(message, 15))

	if (lastNum != 0)

		drawTable(lastNum)	

}



// Convert individual numbers, until the

// user selects cancel on the first 

// prompt of the loop

/////////////////////////////////////////



function calcNum() {

	while(1) {

		var number = prompt("Enter a number in any base:", 0)

		if (number == null) 

			break

		var base1 = prompt("Enter its base:", 10)

		if (base1 == null) 

			continue

		base1 = parseInt(base1)

		var base2 = prompt("Enter the desired base:", 16)

		if (base2 == null) 

			continue

		base2 = parseInt(base2)

		var outputString = number + " (base " + base1 + ") = " 

		outputString += convert(number, base1, base2) 

		outputString += " (base " + base2 + ")"

		alert(outputString)

	}

}



// Ask user for conversion device

// (T-table, I-individual values)

/////////////////////////////////////////



function mainInput() {

	var message = "Enter (T) to create a table or (V) to "

	message += "calculate a value"

	var chosenDevice = prompt(message, "T")

	if (chosenDevice == "T" || chosenDevice == "t")

		getTableAttributes()

	else

		if (chosenDevice == "V" || chosenDevice == "v")

			calcNum()

		else

			alert("Goodbye!")

}



mainInput()



// end hiding content -->

</SCRIPT>
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