Division in javascript?

[Cookiecrumbles222]

function generateDivision() {
            qnum++;
            console.log("Question #" + qnum);
            var d1 = Math.floor(Math.random() * 100);
            var d2 = Math.floor(Math.random() * 100);
            result = prompt(d1 + " / " + d2 + " = " + "?" );
            if(d1 / d2 == Math.floor(result)){
            console.log("Correct!");
            }
            else{
            console.log("Incorrect!");
            }
            
        }  

Hey guys i made this and I was wondering how to change it to work for my assignment the instructions are to "When handling the division arithmetic operation, ensure that the second argument isn’t a 0 and that the resulting answer is a whole number (hint: you may find a while loop and the modulus operator “%” useful here)." how would i go about doing that? Thanks for any help!

[Cookiecrumbles222]

13 minutes ago, Cookiecrumbles222 said:

function generateDivision() {
            qnum++;
            console.log("Question #" + qnum);
            var d1 = Math.floor(Math.random() * 100);
            var d2 = Math.floor(Math.random() * 100);
            result = prompt(d1 + " / " + d2 + " = " + "?" );
            if(d1 / d2 == Math.floor(result)){
            console.log("Correct!");
            }
            else{
            console.log("Incorrect!");
            }
            
        }  

Hey guys i made this and I was wondering how to change it to work for my assignment the instructions are to "When handling the division arithmetic operation, ensure that the second argument isn’t a 0 and that the resulting answer is a whole number (hint: you may find a while loop and the modulus operator “%” useful here)." how would i go about doing that? Thanks for any help!

function generateDivision() {
            qnum++;
            console.log("Question #" + qnum);
            var d1 = Math.floor(Math.random() * 100);
            var d2 = Math.floor(Math.random() * 100);
            
            while (d2 > d1){
            var d1 = Math.floor(Math.random() * 100);
            }
            
            while (d2 == 0){
            var d2 = Math.floor(Math.random() * 100);        
            }
            
            result = prompt(d1 + " / " + d2 + " = " + "?" );
            
            if(d1 / d2 == Math.floor(result)){
            console.log("Correct!");
            }
            else{
            console.log("Incorrect!");
            }
            
        }  

ive narrowed it down to this, but how do i make the two numbers divide to = something whole?

[keskparane]

Follow the hint and find out what the modulus operator does and then consider that in relation to the instructions.

[Cookiecrumbles222]

6 minutes ago, keskparane said:

Follow the hint and find out what the modulus operator does and then consider that in relation to the instructions.

function generateDivision() {
            qnum++;
            console.log("Question #" + qnum);
            var d1 = Math.floor(Math.random() * 100);
            var d2 = Math.floor(Math.random() * 100);
            
            while (d2 > d1){
            d1 = Math.floor(Math.random() * 100);
            }
            
            while (d2 == 0){
            d2 = Math.floor(Math.random() * 100);        
            }
            
            while(d1 % d2 != 0){
            d1 = Math.floor(Math.random() * 100);
            d2 = Math.floor(Math.random() * 100);    
            }
            
            result = prompt(d1 + " / " + d2 + " = " + "?" );
            
            if(d1 / d2 == Math.floor(result)){
            console.log("Correct!");
            }
            else{
            console.log("Incorrect!");
            }
            
        } 

i understand what it does i just don't know how to include it without being terribly messy like this ^^

[bleedblue]

27 minutes ago, Cookiecrumbles222 said:

function generateDivision() {
            qnum++;
            console.log("Question #" + qnum);
            var d1 = Math.floor(Math.random() * 100);
            var d2 = Math.floor(Math.random() * 100);
            result = prompt(d1 + " / " + d2 + " = " + "?" );
            if(d1 / d2 == Math.floor(result)){
            console.log("Correct!");
            }
            else{
            console.log("Incorrect!");
            }
            
        }  

Hey guys i made this and I was wondering how to change it to work for my assignment the instructions are to "When handling the division arithmetic operation, ensure that the second argument isn’t a 0 and that the resulting answer is a whole number (hint: you may find a while loop and the modulus operator “%” useful here)." how would i go about doing that? Thanks for any help!

 

result is not a number. you cant compare d1 / d2 to it.

[bleedblue]

take x % y = z

modulo operator returns the remainder when x is divided by y

so if x = 5, y = 2, z will be 1 since 5 / 2 = 2 remainder 1.

 

Work from that info.

[Guest]

Spoiler

 

If ==0

then it’s zero

 

if %1 != 0

then it’s not a whole number 

 

 

[keskparane]

1 hour ago, Cookiecrumbles222 said:

i understand what it does i just don't know how to include it without being terribly messy like this ^^

so break it down. first you

2 hours ago, Cookiecrumbles222 said:

... ensure that the second argument isn’t a 0....

then if it isn't you make sure that

2 hours ago, Cookiecrumbles222 said:

... the resulting answer is a whole number....

so you would need to compare the result of the division with something

[Mira Yurizaki]

11 hours ago, Cookiecrumbles222 said:

function generateDivision() {
            qnum++;
            console.log("Question #" + qnum);
            var d1 = Math.floor(Math.random() * 100);
            var d2 = Math.floor(Math.random() * 100);
            
            while (d2 > d1){
            d1 = Math.floor(Math.random() * 100);
            }
            
            while (d2 == 0){
            d2 = Math.floor(Math.random() * 100);        
            }
            
            while(d1 % d2 != 0){
            d1 = Math.floor(Math.random() * 100);
            d2 = Math.floor(Math.random() * 100);    
            }
            
            result = prompt(d1 + " / " + d2 + " = " + "?" );
            
            if(d1 / d2 == Math.floor(result)){
            console.log("Correct!");
            }
            else{
            console.log("Incorrect!");
            }
            
        } 

i understand what it does i just don't know how to include it without being terribly messy like this ^^

I see a problem here: If it fails the whole number check and you're generating new random numbers, you're not making sure it passes the checks you did earlier.

 

I'll let you stew on how to resolve this but this what I suggest: Make it impossible for the divisor to be 0 or greater than the dividend (d1) in the first place.

 

If you want a cheat:

Spoiler

var d1 = Math.floor(Math.random() * 100);
var d2 = Math.floor(Math.random() * d1) + 1; 
/* Because Math.random produces a number between 0 inclusive and 1 exclusive, 
   Math.random () * d1 will never be d1, so adding 1 at the end makes it so 
   you cannot have either 0 or d1 + 1*/

while ( d1 % d2 !== 0 ) {
  d1 = Math.floor(Math.random() * 100);
  d2 = Math.floor(Math.random() * d1) + 1;
}