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Q: An R-value is a rating for materials used as?
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What is the difference between lvalue and rvalue?

A variable is a named storage that can hold any value and has 2 values associated with it namely rvalue and lvalue. 'rvalue' is its data value that is its content and "lvalue" is its location value, that is memory address.

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A variable has two associated value with it rvalue and lvalue. 'lvalue' is its location value, that is memory address.

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When there is no addressable value in program, then compiler will give lvalue error. Lvalue or location value is an address that is stored into while rvalue is the "read" value, ie., value of a constant or the value stored at a location. In the assignment a = 31; we have the lvalue of a used on the left hand side and the integer contant value 31 assigned to this location. In the assignment b = a; we have the rvalue of a (31) used to assign to the lvalue of b . So depending on which side of an assignment, we use the variable a , we get two different behaviors

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