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Variable - Concept of programming language:
Variable: As referencing memory by its physical address is very tedious, variable names are used. A variable is a symbolic name given to a memory location. Once a variable is assigned to a memory location, the programmer can refer to that location by variable name instead of its address. Variable is the connection between a name and a value. It is composed of a name, attribute, reference and a value. Attribute means the type of value a variable can hold.
For example the following programming code in C declares variables a & b.
int a,b;
char c;
In the above declaration, a & b are the variable name, which refer to a memory location where integer values can be stored. Instead of address of the memory location, variable names a and b will be used to refer to a memory location in order to store or retriever update its value. Similarly, c is a variable name given to a memory location where a character value can be stored. Further c will be used to refer to the memory location in order to store or retrieve or update its value.
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It would not emerge practical to type an entire program each time it is required, and to avoid this it is possible to store a program on the disk, with the vast advantage that by b
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