I'm writing a program for class that is simple Java. Its a game of War that just keeps track of the score. I need the input to be validated so the user can only enter a value of 2-14 for both cards.
Here is what I have so far: - <html>
-
<body>
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<script type="text/javascript">
-
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document.write("Welcome to the game of war!")
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var playerCard = 99
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var holdTotal = 0
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var playerTotal = 0
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var computerTotal = 0
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while (playerCard !=0) {
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var playerCard = prompt("Enter the card value for the player")
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playerCard = parseInt(playerCard)
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var computerCard = prompt("Enter the card value for the computuer")
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computerCard = parseInt(computerCard)
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-
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if (playerCard > computerCard) {
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document.write("<p>The player wins the hand!")
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playerTotal = playerCard + computerCard + holdTotal + playerTotal
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document.write(" Current score: Player " + playerTotal + " , Computer " + computerTotal)
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}
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else if (computerCard > playerCard) {
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document.write("<p>The computer wins the hand!")
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computerTotal = playerCard + computerCard + holdTotal + computerTotal
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document.write(" Current score: Player " + playerTotal + " , Computer " + computerTotal)
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}
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else {
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holdTotal = playerCard + computerCard
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document.write("<p>The hand is a tie. The hold total is " + holdTotal)
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}
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}
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document.write("<p>Current score: Player " + playerTotal + " , Computer " + computerTotal)
-
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if (playerTotal > computerTotal) {
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document.write("<p>The winner of the game is: Player!")
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}
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else if (computerTotal > playerTotal) {
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document.write("<p>The winner of the game is: Computer!")
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}
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else {
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document.write("<p>The game is a tie.")
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}
-
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</script>
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</body>
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</html>
I want to put the validation after the 1st while loop (playerCard !=0). I have tried this and every time i stick a while validation loop in there it crashes the program. It will still execute, it will just crash when I enter a value
For example: I tried using while (playerCard = 1; playerCard < 0; playerCard > 14) document.write("Error! Please enter card value of (2-14)")
But that crashes the program.
9  1864 
Maybe I came to the wrong place? From looking around, alot of other questions seem really complex. I thought my problem would be simple for you guys.
to make it short, your tried while() syntax is wrong. mind that while() only expects 1 condition.
hint: use logical operators (&&, ||, !)
Another problem: your use of document.write. You can use document.write while the page is loading, but try to avoid it if you can. Do you know how to "write" something to the page without using document.write?
@acoder
No. document.write is the only way I've been taught. The project is due today, so I probably won't get that in. I don't know (&&, !) its a basic psuedocode class.
So if I use if (playerCard = 1 || playerCard < 0 || playerCard > 14) {
document.write("Error! Please enter valid card value")
}
Would that work?
I stuck that piece of code in my program, and when I enter 0 it says that is an invalid number
Never mind, I got it on my own. - <html>
-
<body>
-
<script type="text/javascript">
-
-
document.write("Welcome to the game of war!")
-
var playerCard = 99
-
var holdTotal = 0
-
var playerTotal = 0
-
var computerTotal = 0
-
-
while (playerCard !=0) {
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var playerCard = prompt("Enter the card value for the player")
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playerCard = parseInt(playerCard)
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-
while (playerCard == 1 || playerCard < 0 || playerCard > 14) {
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document.write("<p>Error! Please enter valid card value")
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var playerCard = prompt("Enter the card value for the player")
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playerCard = parseInt(playerCard)
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}
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var computerCard = prompt("Enter the card value for the computer")
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computerCard = parseInt(computerCard)
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-
while (computerCard == 1 || computerCard < 0 || computerCard > 14){
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document.write("<p>Error! Please enter valid card value")
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var computerCard = prompt("Enter the card value for the computuer")
-
computerCard = parseInt(computerCard)
-
}
-
-
if (playerCard > computerCard) {
-
document.write("<p>The player wins the hand!")
-
playerTotal = playerCard + computerCard + holdTotal + playerTotal
-
document.write(" Current score: Player " + playerTotal + " , Computer " + computerTotal)
-
}
-
else if (computerCard > playerCard) {
-
document.write("<p>The computer wins the hand!")
-
computerTotal = playerCard + computerCard + holdTotal + computerTotal
-
document.write(" Current score: Player " + playerTotal + " , Computer " + computerTotal)
-
}
-
else {
-
-
holdTotal = playerCard + computerCard
-
document.write("<p>The hand is a tie. The hold total is " + holdTotal)
-
}
-
}
-
-
document.write("<p>Current score: Player " + playerTotal + " , Computer " + computerTotal)
-
-
if (playerTotal > computerTotal) {
-
document.write("<p>The winner of the game is: Player!")
-
}
-
else if (computerTotal > playerTotal) {
-
document.write("<p>The winner of the game is: Computer!")
-
}
-
else {
-
document.write("<p>The game is a tie.")
-
}
-
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</script>
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</body>
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</html>
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Well, that's good. It's one way to do it. Alternative ways would be to change the while condition to reflect the 2-14 and not 0, or add comments to that effect, and perhaps get rid of the duplicate prompts code.
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