1. what is the difference between a variable and a literal in c/c++?
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The difference between a variable and a constant (or literal constant) is that the constant, once defined, you cannot change its value. AGE is literal constant, 20 is the value assigned to it. ... You cannot assign a value to a literal constant. The literal constant is the value assigned to the variable.
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The basic difference between these two is that const defines constants at compile time, whereas define() defines them at run time. ... consts are always case sensitive, whereas define() allows you to define case insensitive constants by passing true as the third argument.
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So we can say that class variables and instance variables are fields while local variables and parameter variables are not. The question is old but another important difference between a variable and a field is that a field gets a default value when it's declared. A variable, on the other hand, must be initialized.
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Variables are essentially symbols that stand in for a value you're using in a program. At the class level, variables are referred to as class variables, whereas variables at the instance level are called instance variables.
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Difference between Definition and Declaration. ... i.e., declaration gives details about the properties of a variable. Whereas, Definition of a variable says where the variable gets stored. i.e., memory for the variable is allocated during the definition of the variable.
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a global variable isn't defined inside a class, whereas a static variable is. a global variable dies with its file, whereas a static variable dies when no instance of the class in which it is defined exists. That's not right. The only difference between a global variable and a static member variable is scope.
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var declarations are globally scoped or function scoped while let and const are block scoped. var variables can be updated and re-declared within its scope; let variables can be updated but not re-declared; const variables can neither be updated nor re-declared. They are all hoisted to the top of their scope.
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A constant variable requires a storage location, a #define macro does not. A constant variable is still technically a variable so it will take memory storage space, whereas a #defined constant will not.
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In programming, a variable is a value that can change, depending on conditions or on information passed to the program. ... Usually, both constants and variables are defined as certain data type s.
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Local variable is declared inside a function whereas Global variable is declared outside the function. Local variables are created when the function has started execution and is lost when the function terminates, on the other hand, Global variable is created as execution starts and is lost when the program ends.
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The difference between variables and constants is that the value stored in a variable can be changed at any time after it has been created. The value assigned to a constant, as the name suggests, cannot be changed once it has been declared an initialized.
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Declaration of a variable is for informing to the compiler the following information: name of the variable, type of value it holds and the initial value if any it takes. i.e., declaration gives details about the properties of a variable. Whereas, Definition of a variable says where the variable gets stored.
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1. Declaration: Declaration means creating a variable as each variable used in a program must be declared. E.g. int a; ... Initialization: Initialization is declaring a variable and assigning a value at the declaration time called initializing a variable.
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Difference between Declaration, Initialization and Assignment. ... Initialization: When you declare a variable it is automatically initialized, which means memory is allocated for the variable by the JavaScript engine. Assignment: This is when a specific value is assigned to the variable.
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19 Answers. The difference is that const char * is a pointer to a const char , while char * const is a constant pointer to a char . The first, the value being pointed to can't be changed but the pointer can be. The second, the value being pointed at can change but the pointer can't (similar to a reference).
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Only global variables are assigned 0 (false) by default, any local variables are given a non-zero garbage value, which would evaluate to true in a boolean variable. ... You need to either do bool x=false or bool x(false) . Primitives that are not initialized may have ANY value.
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KEY DIFFERENCES: = is used for assigning values to a variable, == is used for comparing two variables, but it ignores the datatype of variable whereas === is used for comparing two variables, but this operator also checks datatype and compares two values.