I tried to answer the question myself and came up with an example.
#include<iostream>
using namespace std;
class A {
public:
int a;
A(int aa) : a(aa) { }
~A() { cout<<"~A()
[code]....
why statements (*) and (**) work ? Since the object a gets destroyed, shouldn't rA be invalid ? Or this is just undefined behavior ?
The error is : invalid initialization of reference of type 'ArrayT<float>&' from expression of type 'const Arrat<float>'...The above errors occur when I tried to do the following code , with operator* overloading :
const ArrayT<float>& b1 = A*A;
ArrayT<float>& c2 = b1*A;// <---- this line makes the error
//b1 is a const ref of ArrayT<float>
//A is just a normal object of ArrayT<float> created by ArrayT<float> A(blah,blah,blah);
The following are the list of operator* overloading :
template <class T>
ArrayT<T>& ArrayT<T>::operator*(ArrayT<T>& b) {blah,blah,blah}
template <class T>
const ArrayT<T>& ArrayT<T>::operator*(ArrayT<T>& b) const
[code]....
I want to use for error multiplication above, but not success.
I am trying to use the Singleton design patterno on Linux, but it is not working:
in the .h I have:
Code:
public:
static ErrorH& Instance();
private:
ErrorH() {};
In the .cpp I have:
Code:
ErrorH& ErrorH::Instance() {
static ErrorH& self = ErrorH();
return self;
}
The errors I get are:
Code:
g++ --g -c ErrorH.cpp -o ErrorH.o
ErrorH.cpp: In static member function "static ErrorH& ErrorH::Instance()":
ErrorH.cpp:9: error: invalid initialization of non-const reference of type "ErrorH&" from a temporary of type "ErrorH"
make: *** [ErrorH.o] Error 1
This code works on Windows, how can I get it to work on Linux?
I am getting this error in lines that involve "ch[_]" in lines 27, 28, 29, 33, 42, 43, 44, and 48, heres the code:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>
struct integer{
int* digits;
int size;
[Code] ....
After looking online for a string replace function in C and finding so many examples that go through the entire string twice. First round to find how number of occurances of substitute in string, using that to malloc for a new string to include additional space for replace, then going through the search string again to get all but what's to be substituted out. I feel it's kind of silly to go through the string twice. Therefore, I'm trying to implement my own string replace, that only searches through the string for what's to be substituted, once.
Here is my code:
Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
char *strreplace(char * string, char * sub, char * replace);
}
[code]....
Here is the same code, but with execution + some syntax highlighting: Ideone.com | Online C Compiler & Debugging Tool..It works great, until it gets to grabbing whatever remains in the search string after the last found sub. The realloc throws a runtime error:
Code:
*** glibc detected *** ./a.out: realloc(): invalid next size: 0x00011008 ***
Aborted From my understanding, this is from me going outside of the bounds of the heap and using memory I haven't allocated, or using a free'd pointer. I'm not seeing where either of these are happening in my code, and was wondering what the best way to go about figuring out where the error exactly occurs.
The exercise consists on 3 procedures. We get the information from a .txt like these:
01/03/2011 A
02/03/2011 F
03/03/2011 C
04/03/2011 T
(...)
Simulating a Videoclub database where the letters stand for the type of movie (A=Action, T=Terror, C=Comedy, ...) and the dates they were rented.
a) How many movies from one specific genre have been rented more than 'n' times? The genre and the value 'n' must be entered by the user.
b) How many movies and which genres belong to a certain date? The date must be entered by the user.
c) Print a list that shows the number of times a movie from each genre has been rented.
So far this is what I've got:
Code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define MAX 100
typedef struct {
int dia,mes, any;
char genere;
[Code] ....
But right now, my main problem is that I can't even debug because i get an error in line 97 --> while (llista[i][j] != EOF) <-- saying "invalid operands to binary != (have 'lloguer' and 'int').
I've tried to cast (int) before "llista[i][j]" but it says that I'm already supposed to get an integer from that.
I catch an exception and want to log it on the console. This works as exepcted, but Valgrind shows me a set of invalid reads.
Here the code of the catch-block:
} catch(HGL::IOException &e) {
logError(e);
}
The signature of the logDebug is: BasicLogger &operator<<(const std::exception &e);
Now valgrind shows me 4 errors like that:
==20943== Invalid read of size 1
==20943== at 0x402C658: strlen (in /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
==20943== by 0x41554DD: std::basic_ostream<wchar_t, std::char_traits<wchar_t> >& std::operator<< <wchar_t, std::char_traits<wchar_t> >(std::basic_ostream<wchar_t, std::char_traits<wchar_t> >&, char const*) (in /usr/lib/i386-linux-gnu/libstdc++.so.6.0.16)
[Code] .....
Generally I dislike invalid read in my code, even if they are harmless like in that case.
If I don't pass a reference, but a copy of the exception, I don't get this invalid reads, but also loose all information, because of the implicit upcasting.
Why I get the illegal read, resp. why std::wstring is deleting it on the way to the <<-operator?
Basically the whole purpose of this program is to prompt the user to use a calculator. Choices 1-6 are valid, but I want to set it up where selecting any other number outside of 1-6 to be Invalid, and will display an 'Invalid Choice' message, and then go back to the main menu.... The main program does work properly, it's the 'Invalid' setup that is giving me problems
Code:
#include <iostream>
#include <iomanip>
using namespace std;
[Code].....
I wanna know why the program doesnt show "Invalid Letter Entered" when i enter any letter other than A S D or M
//Processing the data
if (letter== 'A'||'S'||'M'||'D')// checking Add, subtract, multiply or divide {
if (letter== 'A')//Adding the integers
cout<<"Adding two integers = "<<first + second<<endl;
else if (letter== 'S')//Subtracting the integers {
[code]......
I made a program and when I try to use the main driver to instantiate everything it says invalid storage class for a function. All of my code is in 4 separate files i'm just trying to get it to run now.
Code:
#include "stdafx.h"
#include <iostream>
#include <iomanip>
#include <fstream>
[Code]......
I keep getting an error "Invalid use of void expression" on line 12.
Code:
#include<stdio.h>
#include<stdlib.h>
void initialiaze_array( int size );
void print_array( int size );
void replace( int num, int i );
[Code] ....
I am getting this error invalid use of non static data member.my code looks something like this: i have a main.cpp and 2 class files with respective .h files, say one class file is named human (so i have human.cpp and human.h) and stats (so i have stats.cpp and stats.h) in my stats.h file, i have a double array: double HumanF[10][12] with everything filled in.then in my human.h file i just have a bunch of integers. human.cpp has formulas in it that use numbers from the double array i mentioned. for example
Human::Human() {
constant (this is a double i made in human.h) = (1+Stats::HumanF[0][0]);
i (another double) = pow(constant, ylvl);
(ylvl is also an int I made in my header file)
yhp = i*137;
}
#ifndef BSTCLASS_H_
#define BSTCLASS_H_
#include <string>
using namespace std;
[Code]....
-'ND' is not a type; when I use it as a parameter
or
-invalid use of template name 'ND' without argument list; when I use it as a return type.
On some lines I try access the elements inside of 'ND' variables and I get errors saying that those elements don't exist for the given pointers.
I've created a class that works with vectors doing various calculations and what not. I have overloaded operators that I've created outside of the main in separate header and class files. Ive tested them and the overloaded operators work correctly when I paste them into a the main file but when I have them defined in the other class files and I try to access them in the main class I get an error saying invalid operands to a binary expression. I also have other classes with overloaded operators that work just fine in the main class so I'm not sure what I did wrong here?
This is how I have my header set up, the definitions to these are in a separate class file which I don't think I need to include considering I have them tested and working so I don't think that's the problem (correct me if I'm wrong).
class VectorClass{
friend vector<float> operator+( const vector<float>&, const vector<float>& );
friend vector<float> operator...
friend vector<float> operator...
private:
...
...
public:
...
And then in my main class looks vaguely like this
#include "Name of vector class"
int main(){
vector<float> vR, v1, v2;
v1.push_back('some value');
...
v2.push_back('some value');
...
vR = v1 + v2; // Invalid operands here
return 0;
}
And like I said, I have other classes with overloaded operators set up the same way which work fine being implemented the way I have these, so I'm not sure where the problem is at.
in this area and I have this error Invalid expression term 'out' and Identifier expected; 'out' is a keyword
public static void userDell(string msi,String filename, String DB_CONN_STRING)
{
String temp_msisdn = "+" + msi;
bool ima = DatabaseConnection.checkExist(temp_msi);
[Code].....
I am using visual studio 2012 on windows 7. but, when I have compiled my programs and run them on an older pc to test out its functions, I receive an error saying that the program is not a "valid win32 application." I have even tested this with a very simple hello world console application, but the problem still remains. Where is the error coming from? is the application corrupted during transport? (upload to internet) or are programs compiled on win 7 incompatible with win xp
View 6 Replies View RelatedThe compiler keeps on telling me that invalid conversion from wxBitmap* to wxString on the line with the AddTool function, whiles I do not even try to do such an ambiguous typecast.
wxWidgets 2.9.4
MinGW
gdb
Code:
#include "mainwnd.h"
//namespaces
//other definitions and declarations
CMAINWND::CMAINWND(const wxString& szTitle):wxFrame(NULL,wxID_ANY,szTitle) {
wxImage::AddHandler(new wxBMPHandler);
[Code] .....
I am trying to run a void function and pass parameters to it on a thread using std::thread. However, I keep getting compile errors. When I can get it to compile it does not create the file. Here is my code:
#include <iostream>
#include <thread>
#include <fstream>
void filehandler(char* amount) {
std::fstream output;
output.open("data.txt");
[Code] .....
I am having an issue with the below error saying that there is no data present for the second read item (bold and underlined).
But I can see in the data that both fields have data in them. why the approver2 variable is not being populated?
Error : An unhandled exception of type 'System.InvalidOperationException' occurred in System.Data.dll
Additional information: Invalid attempt to read when no data is present.
C#
string approver = null;
string approver2 = null;
con.Open();
string Approve = "Select Approver"+
",Approver2"+
" From dbo.Tbl_Overview"+
" Where RequestID = '" + STAR.Globals.Detail + STAR.Globals.DetailNum + "'";
[Code] ....
SQL
Select Approver,Approver2 From dbo.Tbl_Overview Where RequestID = 'CR4'
Results
ApproverApprover2
User.1 User2
While executing this code i was getting a error Invalid lvalue in assignment. Can any one tell how to correct this.
dataItem* d=(dataItam*)malloc(10*sizeof(dataItem));
dataItem* temp;
temp=(d+6);
(d+6)=(d+8);//error line
(d+8)=temp;//error line
I making a simple single number scrambler/encryptor and as I tried to build the console application the following error
occurred:
error: invalid operands of types 'void' and 'int' to binary 'operator%'
The source code is bellow.
#include <iostream>
#include <math.h>
#include <cstdlib>
using namespace std;
int main() {
int nTimer;
int nInput;
[Code]......
I am running code::blocks as my IDE on Ubuntu.
Under Microsoft, I use GlobalAlloc and GlobalFree to dynamically allocate and free memory. Intermittently GlobalFree is reporting error 998 (GetLastError() - Invalid access to memory location). I've checked my logs of addresses returned by GlobalAlloc against those being freed by GlobalFree and when the problem occurs the address causing the error has been allocated by GlobalAlloc and has not been freed before since allocation.
I can't reproduce it. Currently I'm checking for error 998 from GlobalFree and ignoring it if it occurs - which is not satisfactory. I have one function (AllocMem) that calls GlobalAlloc and checks for errors and another function (FreeMem) which calls GlobalFree and checks for errors.
My program uses AllocMem and FreeMem everywhere memory is required or freed. AllocMem and FreeMem are in a DLL. The program is heavily threaded and a different thread may call AllocMem to the one that calls FreeMem. I don't believe I've got a race condition etc as all the code in the program containing the AllocMem and FreeMem calls are part of a CriticalSection using the same variable.
What is a possible cause of this error?
I'm getting a template error.
Error
Code:
/data/data/com.n0n3m4.droidc/files/temp.c:92:3: error: invalid use of template-name 'Array' without an argument list
Array::Array(int s): size(s)
^
compilation terminated due to -Wfatal-errors.
Code:
// headers
#include <iostream>
#include <utility>
#include <cctype>
// stuff we need from namespace std
using std::cout;
using std::cin;
[Code] .....
Code:
#include <stdio.h>
void f( char *a ) {
((int *)a)[1][1] = 8;
}
int main() {
int a[2][3] = {
[Code] ....
3.cpp: In function 'void f(char*)':
3.cpp:5: error: invalid types 'int[int]' for array subscript
Code:
class Base {
public:
int base;
Base(int init=0):base(init){}
virtual ~Base(){}
[Code] .....
Invalid initialization of non-const reference of type 'Base&' from an rvalue of type 'Derived'
What does it mean, and why can't I return the Derived class by value (I'm trying to create an exact copy of Derived).
Identify the invalid C expression or choose "all are valid". Assume all variables are integer and non-zero.
7.
a) a+b-0 b) c+-a%4 c) xm6-24 d) xf3r6+2
e) all are valid
8.
a) xx+yy%zz b) z%(z%z%z)) c) ha+ha+ha d) x23-20.4
e) all are valid
[Code] ......