javascript operator code help?

Question

Is there an operator that you can place between 2 sets of numbers that tells the program that the inputed info is anything inbetween or equal to that set of numbers?
I'm supposed to create a script that asks for the student's percentage point through a prompt box and then spits out a letter grade in an alert box. The first one was was easy enough but i have become stuck on the rest. 
If anything resulting between a 80 and 89 equals a B, what kind of operator or how would i right that out to get the right responce in an alert window?

If Else Statement:
if (gradePercent >= 90)
{
  alert("Your letter grade is an A");
  }
else if (gradePercent ________)
{
  alert("Your letter grade is a B");
  }

C B · Accepted Answer

else if (gradePercent >= 80 && gradePercent < 90)
{
alert("Your letter grade is a B");
}

Bryan A · Answer

I believe you should be able to use both a less than and greater than with an and to get what you want:

else if (gradePercent <= 89 && gradePercent >= 80)

or

else if ((gradePercent <= 89) && (gradePercent >= 80))

Sídhe · Answer

what goes into the blank is   ">= 80"

Unlike the other answers, you don't have to put in  "&& gradePercent < 90" because if it was 90 or more, the if statement above it would have gotten it and it would not have fallen to the else.

gucciardo · Answer

provided that y=5, the table under explains the arithmetic operators: + Addition ---------------------------------- x=y+2 x=7 - Subtraction ----------------------------- x=y-2 x=3 * Multiplication --------------------------- x=y*2 x=10 / branch ---------------------------------- x=y/2 x=2.5 % Modulus (branch the rest) ----- x=yp.c.2 x=a million ++ Increment -------------------------------- x=++y x=6 -- Decrement ------------------------------ x=--y x=4

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javascript operator code help?

4 Answers