While loop and outputting math operators

Question

I'm trying to create a while loop that outputs a list of values, adds them together, and outputs a total with an "=" sign at the end I.e., if the User enters the numbers 5 and 12, the output would show up like this: 5 + 6 + 7 + 8 + 9 + 10 + 11 + 12 = total

This is how my 'while' loop looks right now:

while(enteredNum1 <= enteredNum2){
    total += enteredNum1;
    document.write(enteredNum1 + " + ");
    enteredNum1++;
}

document.write("= " + total);

I know it will always append the " + ", but can anyone point me in the right direction for having the last value show "=" instead of the "+" again?

you could write the plus separate to enteredNum1 and check if the loop will run again, if it will write the + otherwise carry on — Quince
– Quince, Commented Oct 28, 2014 at 16:10

Alex K. · Accepted Answer · 2014-10-28 16:13:19Z

5

Alternative;

var numbers = [];
while(enteredNum1 <= enteredNum2){
    total += enteredNum1;
    numbers.push(enteredNum1++);
}

document.write(numbers.join(" + ") + " = " + total);

answered Oct 28, 2014 at 16:13

Alex K.

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Comments

KyleK · Accepted Answer · 2014-10-28 16:14:32Z

1

Proper way:

list = [];
total = 0;
enteredNum1 = parseInt(enteredNum1); // parseInt only if enteredNum1 can be a string
while(enteredNum1 <= enteredNum2) {
    total += enteredNum1;
    list.push(enteredNum1);
    enteredNum1++;
}

document.write(list.join(" + ") + " = " + total);

answered Oct 28, 2014 at 16:14

KyleK

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Comments

mswieboda · Accepted Answer · 2014-10-28 16:15:32Z

0

Any easy way would be an if statement checking if the loop will continue:

while(enteredNum1 <= enteredNum2) {
    total += enteredNum1;
    if (enteredNum1 + 1 <= enteredNum2) {
        document.write(enteredNum1 + " + ");
    } else {
        document.write(enteredNum1);
    }

    enteredNum1++;
}

document.write(" = " + total);

Alternatively, saving the output as a string and taking the "+" off using substring would work as well

answered Oct 28, 2014 at 16:15

mswieboda

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3 Comments

kmancusi Over a year ago

Thank you, SuckerForMayhem! Never considered using an if/else within the while loop!

KyleK Over a year ago

Consider using an array instead of calling many times document.write and increase complexity with if/else. See below.

mswieboda Over a year ago

@KyleK I agree, using an array and join is better, this was just a simple alteration

ReeCube · Accepted Answer · 2014-10-28 16:12:06Z

0

This should work:

total += enteredNum1;
document.write(enteredNum1);
enteredNum1++;

while(enteredNum1 <= enteredNum2){
    total += enteredNum1;
    document.write(" + " + enteredNum1);
    enteredNum1++;
}

document.write("= " + total);

answered Oct 28, 2014 at 16:12

ReeCube

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