Compiler Error Lvalue Required
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about
Lvalue Required Error In Turbo C++
hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges how to remove lvalue error in c Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other.
R Value Required Error In C
Join them; it only takes a minute: Sign up What does “lvalue required” mean in a C compiler error? [closed] up vote 0 down vote favorite #include //line 1 #include //line 2 void main() //line 3 { //line 4 lvalue required string int a=6,g=7,b=3; //line 5 clrscr(); //line 6 printf("%d",a>?g=a:g=b); //line 7 getch(); //line 8 } Case 1: before saving the file This will give an error at line no 7 'Lvalue required'. But when I compile no error will come and after running, it produced output 3. Case 2 : after saving the file And when we save this file then we get an error "Lvalue required'. sorry for my mistake and Write question here #include //line 1 #include r value error in c //line 2 void main() //line 3 { //line 4 int a=6,g=7,b=3; //line 5 clrscr(); //line 6 printf("%d",a>b?g=a:g=b); //line 7** getch(); //line 8 } Case 1: before saving the file This will give an error at line no 7 'Lvalue required'. But when I compile no error will come and after running, it produced output 3. Case 2 : after saving the file And when we save this file then we get an error "Lvalue required'. c lvalue share|improve this question edited Aug 24 '14 at 15:57 Jonathan Leffler 438k61508822 asked Nov 23 '12 at 6:28 ajava 22138 closed as not a real question by H2CO3, talonmies, Jens Gustedt, lenik, WhozCraig Nov 23 '12 at 8:53 It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question. 1 Any reason you are writing a>b?g=a:g=b;? more readable to do g= a>b?a:b. Not sure whats happening in the printf. One of these 2 are probably your issue. –Karthik T Nov 23 '12 at 6:31 2 Well, it means that an lvalue is required, what else? –user529758 Nov 23 '12 at 6:33 I
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow
How To Remove Lvalue Required Error In C++
Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow how to solve lvalue required error in c++ is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Error: lvalue required in
L Value In C
this simple C code? (Ternary with assignment?) up vote 8 down vote favorite 7 I have : #include int main() { int a=5,b=6; (a>b)?b=a:b=b; // Here is the error return 0; } But if I replace : (a>b)?b=a:b=b; // Error with (a>b)?(b=a):(b=b); // http://stackoverflow.com/questions/13524104/what-does-lvalue-required-mean-in-a-c-compiler-error No-Error I understand the lvalue is a value to which something can be assigned and how is it different from rvalue, but why is the extra parenthesis making the difference. c ternary-operator conditional-operator share|improve this question edited Dec 11 '11 at 10:45 user166390 asked Aug 6 '11 at 10:51 Yugal Jindle 13.6k2583159 3 C and C++ are not the same language. Your question is for C. –Delan Azabani Aug 6 '11 at 11:02 Ya... I know that.. but the exact code behaves same in http://stackoverflow.com/questions/6966299/error-lvalue-required-in-this-simple-c-code-ternary-with-assignment both C and C++ –Yugal Jindle Aug 6 '11 at 13:10 add a comment| 4 Answers 4 active oldest votes up vote 7 down vote accepted Assignment has a lower precedence than the ternary operator so the line evaluates like: ((a>b)?b=a:b)=b; use: b=(a>b)?a:b; share|improve this answer answered Aug 6 '11 at 10:58 Scott Logan 81611025 1 -1, not true. See the wikipedia explanation at en.wikipedia.org/wiki/Operators_in_C_and_C%2B%2B#Notes –Johannes Schaub - litb Aug 6 '11 at 11:17 I'm sorry I don't see it, they show e = a < d ? a++ : a = d being parsed like e = ((a < d ? a++ : a) = d) which appears to be similiar to what I have written. Do you mean the part where it says it shouldn't be parsed? –Scott Logan Aug 6 '11 at 11:25 add a comment| up vote 14 down vote Actually, in C, this code (a>b)?b=a:b=b; is parsed by many compilers as ((a>b)?b=a:b)=b; which is an error, as the expression ((a>b)?b=a:b) evaluates to an rvalue which you try to assign with b which results in an error. Trying to assign an rvalue is an error. If it is not parsed that way, then its simply a syntax error. But a C compiler is NOT allowed to parse it as: ((a>b)?b=a:(b=b)); //not allowed to parse by C language Because the grammar of C does not allow a compiler to parse the code as above. But what you've written (the original code) is correct as C++. Here the grammars of C and C++ di
Programming Boards C Programming Lvalue required error Getting started with C or C++ | C Tutorial | C++ Tutorial | C and C++ FAQ | Get a compiler | Fixes for http://cboard.cprogramming.com/c-programming/110763-lvalue-required-error.html common problems Thread: Lvalue required error Thread Tools Show Printable Version Email this Page… http://www.cplusplus.com/forum/beginner/136948/ Subscribe to this Thread… Display Linear Mode Switch to Hybrid Mode Switch to Threaded Mode 01-03-2009 #1 eklavya8 View Profile View Forum Posts Registered User Join Date Jan 2008 Posts 30 Lvalue required error when do we get an lvalue required error and an rvalue required error. 01-03-2009 #2 Adak View Profile View Forum Posts Registered User Join error in Date Sep 2006 Posts 8,868 When you're damn unlucky! 01-03-2009 #3 root4 View Profile View Forum Posts Registered User Join Date Apr 2008 Posts 396 if you try 5=5 you get an 'invalid lvalue in assignment'-like error, is it what you mean? it happens when the left side of an assignement is not...assignable (i.e. a variable). I don't see any situation in which you would get the equivalent for an rvalue, as error in c it would rather result in a syntax error... What was the point of the question? any context? 01-03-2009 #4 tabstop View Profile View Forum Posts and the Hat of Guessing Join Date Nov 2007 Posts 14,185 A (modifiable) lvalue is required for assignment. If you have this = that; then this has to be an lvalue. There are no such things as rvalues in C, although sometimes people use it to mean "something that could be on the right-hand side of a assignment". 01-03-2009 #5 eklavya8 View Profile View Forum Posts Registered User Join Date Jan 2008 Posts 30 Originally Posted by root4 if you try 5=5 you get an 'invalid lvalue in assignment'-like error, is it what you mean? it happens when the left side of an assignement is not...assignable (i.e. a variable). I don't see any situation in which you would get the equivalent for an rvalue, as it would rather result in a syntax error... What was the point of the question? any context? Code: int a[]={1,5,6,8}; for(int j=0;j<5;j++) { printf("%d",*a); a++; } gives this error,ny idea why? 01-03-2009 #6 tabstop View Profile View Forum Posts and the Hat of Guessing Join Date Nov 2007 Posts 14,185 Originally Posted by eklavya8 Code: int a[]={1,5,6,8}; for(int j=0;j<5;j++) { printf("%d",*a); a++; } gives
Thanks in advance:) 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
#include #include class Tour { char Tcode[20]; int NoofAdults, NoofKids, Kilometers; float TotalFare; public: Tour() { Tcode="NULL"; //Here comes the Error NoofAdults=0; NoofKids=0; Kilometers=0; TotalFare=0; } void AssignFare(int NoofAdults, int NoofKids, int Kilometers) { if(Kilometers<500) TotalFare=200*NoofAdults+100*NoofKids; if(Kilometers<1000 && Kilometers>=500) TotalFare=300*NoofAdults+150*NoofKids; if(Kilometers>=1000) TotalFare=500*NoofAdults+250*NoofKids; } void EnterTour() { cin>>Tcode>>NoofAdults>>NoofKids>>Kilometers; AssignFare(NoofAdults, NoofKids, Kilometers); } void ShowTour(); { cout<<"Tour Code : "<"\n"; cout<<"No of Adults = "<"\n"; cout<<"No of Kids = "<"\n"; cout<<"Kilometers = "<"\n"; cout<<"Total Fare = "<void main() { clrscr(); Tour T; T.EnterTour(); T.ShowTour(); getch(); } Last edited on Jun 29, 2014 at 5:16pm UTC Jun 29, 2014 at 5:00pm UTC Chervil (5756) What sort of creature is 'NULL" ? It begins with a single quote and ends with a double quote. Was it intended to be simply NULL or the character string "NULL"? In either case, the assignment statement is attempting to modify the address of the character array Tcode, which is the main problem. If you want to copy a C-string, use strcpy(): http://www.cplusplus.com/reference/cstring/strcpy/ Last