Question

(1 point) Using an if Statement In a Loop

A common thing to do is to use variables to keep track of some sort of count. When used in a loop we count things very quickly.

Scenario: If you roll a pair of dice, rolling a 12 (two sixes) is rare. How rare? If you were to roll a pair of dice 1,000 times, on average, how many times would it come up as 12?

To figure this out, we could write code to run an experiment. It would go something like this:

• Make a loop that simulates rolling a pair of dice 1,000 times.
• Inside the loop, add an if statement: if die1 + die2 == 12, then add 1 to a counter.
• After the loop, display the result.

var die1 = -1;

var die2 = -1;

var loopNum = 0; //use to count number of loops

var twelveCount = 0; //use to count 12's

while(loopNum < 1000){

loopNum++;

die1 = randomNumber(1, 6);

die2 = randomNumber(1, 6);

console.log("Rolled a " + die1 + " and a " + die2 + " for a total of " + (die1 + die2));

}

console.log("The number of times 12 was rolled was: " + twelveCount);

console.log("Done.");

The starter code sets up the whole experiment for you, except it doesn't count the number of 12's rolled - that's your job. Note: If you remove (or comment out) the console.log statement that displays every roll of the dice, the experiment will speed up A LOT! You could do tens of thousands of dice rolls in a matter of seconds.

Answer 1

var die1 = -1;
var die2 = -1;
var loopNum = 0; //use to count number of loops
var twelveCount = 0; //use to count 12's
while(loopNum < 1000){
loopNum++;
die1 = randomNumber(1, 6);
die2 = randomNumber(1, 6);

if ((die1 + die2)==12) {
++twelveCount;
}
}
console.log("The number of times 12 was rolled was: " + twelveCount);
console.log("Done.");


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SEE OUTPUT


Thanks, PLEASE COMMENT if there is any concern.