What value is stored in uninitialized variables?

What value is stored in uninitialized variables?

The value in an uninitialized variable is one of: zero, a compiler dependent value (such as 0xCC’s in visual studio), or data previously stored in that memory location (old data).

What is the value of uninitialized?

undefined value
An uninitialized variable has an undefined value, often corresponding to the data that was already in the particular memory location that the variable is using.

What is the value of uninitialized variable 0?

Java does not have uninitialized variables. Fields of classes and objects that do not have an explicit initializer and elements of arrays are automatically initialized with the default value for their type (false for boolean, 0 for all numerical types, null for all reference types).

Are uninitialized variables automatically initialized to zero?

Unlike some programming languages, C/C++ does not initialize most variables to a given value (such as zero) automatically. A variable that has not been given a known value (usually through initialization or assignment) is called an uninitialized variable. …

What is uninitialized data?

uninitialized data starts at the end of the data segment and contains all global variables and static variables that are initialized to zero or do not have explicit initialization in source code.

What is garbage value?

Answer: If a variable is assigned but not allocated in some programming languages such as C, it is said to have a garbage value, such that, certain data kept by some random set of the storage of the computer. …

What is the value of uninitialized variable PHP?

Uninitialized variables have a default value of their type depending on the context in which they are used – booleans default to FALSE, integers and floats default to zero, strings (e.g. used in echo) are set as an empty string and arrays become to an empty array.

What is the value of an uninitialized int?

The value in an uninitialized variable can be anything – it is unpredictable, and may be different every time the program is run. Reading the value of an uninitialized variable is undefined behaviour – which is always a bad idea.

What is the value of an uninitialized object in Java?

They are null by default for objects, 0 for numeric values and false for booleans. For variables declared in methods – Java requires them to be initialized.

What is garbage variable?

If a variable is assigned but not allocated in some programming languages such as C, it is said to have a garbage value, such that, certain data kept by some random set of the storage of the computer.

Is null a garbage value?

Setting an object reference to null only makes it eligible for garbage collection. When the garbage collector runs,it frees up the heap by deleting only the objects which are eligible for garbage collection.

What is the difference between uninitialized and undefinited variables?

An uninitialized variable is just a variable that has been declared, but has not been assigned a value when it was declared. And also undefinited variable is the one without number but with a string instead? No, an undefined variable is a non-existent variable.

What happens if you declare an undefined variable in JavaScript?

Even if you just declare a value and do not assign it a value, JavaScript will still give it a value of undefined (behind-the-scenes). An uninitialized variable is just a variable that has been declared, but has not been assigned a value when it was declared.

How to declare a variable but not initialize it in JavaScript?

If you just use the var, let or const in front, the variable is declared, but not initialized. For example, the following variable is declared but not initialized: In the following example, the variable is initialized with a string:

What does it mean when a variable is initialized in Java?

No, initialized means a variable was declared (i.e. using var, let, or const) and was assigned a value. The value could be of any type (number, string, object, boolean, etc).