- 1 What is long used for in Java?
- 2 What is a long variable?
- 3 Is a long an int?
- 4 What is difference between long and int?
- 5 Should I use long or int?
- 6 What are constructors in Java?
- 7 What are the 5 main data types?
- 8 What is difference between double and string?
- 9 What is a long value?
- 10 Why do we use long int?
- 11 What is a double vs float?
- 12 How long is long long int?
- 13 Why are int and long the same size?
- 14 How long is int in Java?
- 15 Is Long a datatype in C?
What is long used for in Java?
The Java long keyword is a primitive data type. It is used to declare variables. It can also be used with methods. It can hold a 64-bit two’s complement integer.
What is a long variable?
Long variables are extended size variables for number storage, and store 32 bits (4 bytes), from -2,147,483,648 to 2,147,483,647. If doing math with integers at least one of the values must be of type long, either an integer constant followed by an L or a variable of type long, forcing it to be a long.
Is a long an int?
An int is a 32-bit integer; a long is a 64-bit integer. int and long are primitive types, while Integer and Long are objects.
What is difference between long and int?
The basic difference between the type int and long is of their width where int is 32 bit, and long is 64 bits. The types int and long when counted in bytes instead of bits the type int is 4 bytes and the type long is just twice if type int i.e. 8 bytes.
Should I use long or int?
The typical thing to do is to just use int if you don’t care about the size of the integer. If you need a 64-bit integer, then you use long. If you’re trying to use less memory and int is far more than you need, then you use byte or short.
What are constructors in Java?
A constructor in Java is a special method that is used to initialize objects. The constructor is called when an object of a class is created.
What are the 5 main data types?
The data types to know are:
- String (or str or text). Used for a combination of any characters that appear on a keyboard, such as letters, numbers and symbols.
- Character (or char ). Used for single letters.
- Integer (or int ). Used for whole numbers.
- Float (or Real).
- Boolean (or bool ).
What is difference between double and string?
Double is for real numbers (i.e. numbers which have decimal points in them!). (They can have up to around 12 significant figures.) The String type is for character strings (like names etc). TextBoxes are defined as String types.
What is a long value?
Long is a data type used in programming languages, such as Java, C++, and C#. A constant or variable defined as long can store a single 64-bit signed integer. 64-bit means the number can store 263 or 18,446,744,073,709,551,616 different values (since one bit is used for the sign).
Why do we use long int?
On Linux environment the long takes 64-bit (8-bytes) of space, and the long long takes 128-bits (16-bytes) of space. This is used when we want to deal with some large value of integers. We can test the size of different types using this simple program.
What is a double vs float?
While float has 32 bit precision for floating number (8 bits for the exponent, and 23* for the value), i.e. float has 7 decimal digits of precision. As double has more precision as compare to that of flot then it is much obvious that it occupies twice memory as occupies by the float data type.
How long is long long int?
A long int is a signed integral type that is at least 32 bits, while a long long or long long int is a signed integral type is at least 64 bits. This doesn’t necessarily mean that a long long is wider than a long. Many platforms / ABIs use the LP64 model – where long (and pointers) are 64 bits wide.
Why are int and long the same size?
int and long are both 4 bytes (32 bits) and long long int is 8 bytes or 64 bits (atleast in C). Check this for more a demo on ideone (on gcc 4.8. 1). The standard only requires ints to be stored in at least 16 bits, and longs in 32 bits.
How long is int in Java?
Primitive Data Types
|byte||1 byte||Stores whole numbers from -128 to 127|
|short||2 bytes||Stores whole numbers from -32,768 to 32,767|
|int||4 bytes||Stores whole numbers from -2,147,483,648 to 2,147,483,647|
|long||8 bytes||Stores whole numbers from -9,223,372,036,854,775,808 to 9,223,372,036,854,775,807|
Is Long a datatype in C?
Main types. The C language provides the four basic arithmetic type specifiers char, int, float and double, and the modifiers signed, unsigned, short, and long. It is an integer type. Actual type can be either signed or unsigned.