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  • what is r value, l value error in c??

    tanvisharma

    Member

    Updated: Oct 26, 2024
    Views: 2.4K
    can anybody give a clear explanation about 'r' and 'l' value error in c.....
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Replies

  • Anoop Kumar

    Member • May 14, 2012

    I am not in C progamming any more but I found this, it might help you.
    Suppose the code is
    int i;
    i=5;
    here i is lvalue and 5 is Rvalue.
    the code 5=i;
    generateserror lvalue required.

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  • Ankita Katdare

    Administrator • May 15, 2012

    #-Link-Snipped-# Did you get an error in a specific program? We can be of better help if you share the exact problem with us.

    The difference between an l-value and an r-value can be used for eliminating a common bug.
    Programmers sometimes wrongly replace the = operator for the == operator.
    This reverses the order of an equality expression, placing the r-value on the left, like this:
    if (0==x) //instead of x==0
    When placing the r-value on the left, mistyping the == operator as the = operator triggers a compilation error:
    if (0=x) // error: "L-value required"
    Although this isn't the most intelligible error message, it certainly catches the bug.
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  • pratap singh, upendra

    Member • May 25, 2012

    during the process of assignment of value to the variable whichever variable comes on the left hand side of equals sign is the lvalue meaning left_value. On the other hand the variable or a value appearing on the right hand side of equals sign is the rvalue meaning right_value.

    The concept of rvalue and lvalue was just a theoretical notion that came into being on account of confusion that arose between = and == operators.

    for example, consider

    a = 9;
    a = b;
    in the first case the value of a is assigned to be 9. this implies lvalue is a and rvalue is 9
    in the second case lvalue is a while rvalue is another variable b.

    Note that lvalue should necessarily be a variable. On the other hand rvalue can be a varaible or a constant of appropriate data type
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  • pratap singh, upendra

    Member • May 25, 2012

    during the process of assignment of value to the variable whichever variable comes on the left hand side of equals sign is the lvalue meaning left_value. On the other hand the variable or a value appearing on the right hand side of equals sign is the rvalue meaning right_value.

    The concept of rvalue and lvalue was just a theoretical notion that came into being on account of confusion that arose between = and == operators.

    for example, consider

    a = 9;
    a = b;
    in the first case the value of a is assigned to be 9. this implies lvalue is a and rvalue is 9
    in the second case lvalue is a while rvalue is another variable b.

    Note that lvalue should necessarily be a variable. On the other hand rvalue can be a varaible or a constant of appropriate data type
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  • tanvisharma

    Member • May 28, 2012

    thank you all 😀
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  • Aviskar

    Member • May 31, 2012

    can anybody tell me what is this pointer and how it is used in c++?
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  • amitabh1608

    Member • Jun 3, 2012

    refer any c++ book
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  • Anthoni Raj

    Member • Jun 3, 2012

    AbraKaDabra
    #-Link-Snipped-# Did you get an error in a specific program? We can be of better help if you share the exact problem with us.

    The difference between an l-value and an r-value can be used for eliminating a common bug.
    Programmers sometimes wrongly replace the = operator for the == operator.
    This reverses the order of an equality expression, placing the r-value on the left, like this:
    if (0==x) //instead of x==0
    When placing the r-value on the left, mistyping the == operator as the = operator triggers a compilation error:
    if (0=x) // error: "L-value required"
    Although this isn't the most intelligible error message, it certainly catches the bug.

    Your answer is good...
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