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left-value: an expression that can be target of assignement.
eg:
array[x+1]->field = 100; # okay
100 = 200; # NOT okay: not lvalue
intvar = 100; # okay
(char *)intvar = "STR"; # NOT okay: not lvalue
*(char **)&intvar = "STR"; okay
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Viva questions of c language?
lvalue
What is Lvalue in c?
An lvalue is an object that can be assigned a value, i.e. it can be on the left side of an equals sign, hence the term lvalue.If the compiler is complaining, you are probably trying to assign a new value to an rvalue, such as an array name or constant.
When will lvalue error occur in c?
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
What represents the left hand side of a binary operator in c plus plus?
The left hand operand of a binary operator must represent a modifiable lvalue: void f (const int x, int y) { x = y; // error -- x is constant lvalue y = x; // ok }
Explain the following tearm in the context of object oriented programming Also explain how these concept are implement in c by given an example program for each?
Explain the following terms in the context of object oriented programming. Also explain how these concepts are implemented in C++ by giving an example program for each.
What is the syntax of increment operator?
Pick one: ++ lvalue lvalue ++ lvalue += value
What is lvalue?
A variable has two associated value with it rvalue and lvalue. 'lvalue' is its location value, that is memory address.
What is the lvalue error?
Most likely it is 'lvalue required' error, examples: 10= x; ++3;
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.
Viva questions of c language?
lvalue
What is Lvalue in c?
An lvalue is an object that can be assigned a value, i.e. it can be on the left side of an equals sign, hence the term lvalue.If the compiler is complaining, you are probably trying to assign a new value to an rvalue, such as an array name or constant.
When will lvalue error occur in c?
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
What is L value error in C?
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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What is bcnf explain with example?
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What represents the left hand side of a binary operator in c plus plus?
The left hand operand of a binary operator must represent a modifiable lvalue: void f (const int x, int y) { x = y; // error -- x is constant lvalue y = x; // ok }
