This community-built FAQ covers the “booleans” exercise from the lesson “Learn Java: Variables”.
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This exercise can be found in the following Codecademy content:
Learn Java
FAQs on the exercise booleans
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Create a variable called intsCanHoldDecimals . Set it to true if the int type can hold a decimal number. Set it to false if the int type cannot do this.
Doesn’t the set of decimal numbers contain the set of integers? I’m not sure because I didn’t learned arithmetic in English. For me, the assertion “the int type can hold a decimal number” is true, because I think the int type can hold a decimal number which is an integer. (Of couse, “the int type can hold all decimal numbers” is false.)
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Create a variable called intsCanHoldDecimals . Set it to true if the int type can hold a decimal number. Set it to false if the int type cannot do this.
Hello there,
how does intCanHoldDecimals distinguish whether the user will input decimal or integer? Or is that not part of the question? The solution to this question is…
public class Booleans {
public static void main(String args) {
boolean intsCanHoldDecimals = false;
System.out.println(intsCanHoldDecimals);
}
}
int in Java is a wholly different thing. “int” in Java cannot hold a decimal number whereas “double” in Java can
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Notes from the course:
//int holds positive numbers, negative numbers, and zero. They do not store fractions or numbers with decimals in them. The int data type allows values between -2,147,483,648 and 2,147,483,647,
//double can hold decimals as well as very large and very small numbers. The maximum value is 1.797,693,134,862,315,7 E+308, which is approximately 17 followed by 307 zeros. The minimum value is 4.9 E-324, which is 324 decimal places.
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Notes from the course:
Primitive datatypes are types of data built-in to the Java system
//int holds positive numbers, negative numbers, and zero. They do not store fractions or numbers with decimals in them. The int data type allows values between -2,147,483,648 and 2,147,483,647,
//double can hold decimals as well as very large and very small numbers. The maximum value is 1.797,693,134,862,315,7 E+308, which is approximately 17 followed by 307 zeros. The minimum value is 4.9 E-324, which is 324 decimal places.
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Decimal numbers are integers and non-integers like 10 and 0.3 - so in general “int” cant hold all of them. Doublles can.
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So “a decimal number” in their statement should be read as “any decimal number” or so? Are people reading this as “one of decimal numbers” few?
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Welcome to the world of coding. Appreciate you write in Java as elsewhere there are even more dragons to fight. Google “thank you for inventing javascript” phrase and you’ll understand.
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I see. What I had in mind was the concept of mathematically defined numbers, but the numbers here are internally represented data stored in memory.
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10 is a decimal number. int type can hold 10. But 10 of int type is not called a decimal number here.
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