C :: Declaration And Definition Of A Variable

May 11, 2013

I read that Memory is allocated during definition of a variable and not during declaration. Declaration is something like,

Code: int x;

And definition is assigning some value to it. This is what my professor taught. My doubt is if memory is not allocated during declaration, then how the compiler successfully compiles and runs the following, which i had already tried.

Code:
#include<stdio.h>
#include<conio.h>
int main() {
int c;
int *p=&c;
printf("%x",p);
getch();
return 0;
}

The variable c is only declared. But the program outputs a memory address. Shouldn't it show an error?

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C :: Declaration And Definition Of External Variable

Jan 11, 2014

Why I take warning on this code :

Code:
#include<stdio.h>
extern int v = 0; // Declaration and definition of an external
int main(void)

[code]...

Is there any error? Why I take a warning: 'v' initialized and declared 'extern'|||=== Build finished: 0 errors, 1 warnings ===| ???

and what is the meaning of :An extern declaration that initializes a variable serves as a definition of the variable. This rule prevents multiple extern declarations from initializing a variable in different ways.

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C/C++ :: Structures Declaration And Definition

Dec 17, 2013

is possible to combine structures declaration and definition in programming language?

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C :: Array Of Functions Declaration / Definition And Call

Aug 3, 2013

i am using c language to program PIC micro controllers, i am making a multi compilation unit project in order to organize my code better.

I want to create an array of functions and be able to call it from anyplace in the code

what i have done so far gplib.c

Code:
typedef void (*out)(int8);
void OUT_A(int8 weight){output_A(weight);}
void OUT_B(int8 weight){output_B(weight);}
void OUT_C(int8 weight){output_C(weight);}
void OUT_D(int8 weight){output_D(weight);}
void OUT_E(int8 weight){output_E(weight);}
out output_port[5+1] = {OUT_A, OUT_B, OUT_C, OUT_D, OUT_E};

how to declare them in gplib.h and how to call them anywhere in the code.

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C++ :: Using Template Class - Unable To Match Function Definition To Existing Declaration

May 12, 2013

I am just learning using class template but I keep getting error unable to match function definition to an existing declaration

template <typename T>
class Homework {
private:
string name;
public:
template <typename T>
void SetName(T val);

[Code] ....

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C++ ::  Errors With Using Templates - Unable To Match Function Definition To Existing Declaration

Apr 13, 2013

I've written the following code and keep getting the errors:

Error1error C2244: 'Supermarket<temp>::operator =' : unable to match function definition to an existing declaration
Error2error C2244: 'Supermarket<temp>::setName' : unable to match function definition to an existing declaration
Error3error C2244: 'Supermarket<temp>::setArea' : unable to match function definition to an existing declaration

#ifndef SUPERMARKET_H
#define SUPERMARKET_H

#include<string>
#include<iostream>
using namespace std;

[Code] .....

I moved the files to the .h file, and now I'm getting

Error2error LNK1120: 1 unresolved externals

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C++ :: Static Variable Declaration

Oct 4, 2014

If i declare 2 variables like this static int first, second; will both of them be declared static or will only first be declared static and second a regular variable?

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C++ :: Class And Variable Declaration?

Aug 2, 2014

#include<iostream>
#include<conio.h>
#include<string>
using namespace std;
class ir;
class Bank_acc {
private:
string name,type,s;
long int accno,temp,balance,in;

[Code]....

errors are:

|6|error: forward declaration of 'class ir'|
|54|error: invalid use of incomplete type 'class ir'|
|99|error: no matching function for call to 'ir::interest()'|

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C++ :: Access Variable From Other Scope Without Global Declaration?

Aug 8, 2013

Code:
#include <iostream>
using namespace std;
void f() {
int x=17;
//cout<<main::y<<endl; i want to access y from main scope
}

int main() {
int y=23;
//cout<<f::x<<endl;

I want to access x from f scope is there any way for this without global declaration? specially about function scopes...

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C++ :: Difference Between Variable Declaration Inside And Outside For Loop

Sep 10, 2013

What is difference (memory allocation or any) between declaring a variable inside or outside the variable

program1:

#include<stdio.h>
int main() {
int i;
for (i=0;i=<100;i++) {

[Code] .....

Difference b/w program1 and program2. Its look both are same. but my compiler shows something difference.

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C++ :: T Minus Loops - Variable Index Declaration

Apr 25, 2014

(while)

T minus 10 and counting
T minus 9 and counting
T minus 8 and counting
T minus 7 and counting
T minus 6 and counting
T minus 5 and counting
T minus 4 and counting
T minus 3 and counting
T minus 2 and counting
T minus 1 and counting

Declare the following index before the while loop:

int index = 10;

Correctly code a while statement below using the variable index as defined above, to produce the output shown above.

So this is what my code looks like... I also have to convert this same loop into a do while and for loop. So if I can get this one right I think the others should come relatively easy.

while (int index >= 10) {
cout << "T minus " << index;
index--;
}

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C++ :: Declaration Of Variable To Hold A Table Of 5 Records

Aug 27, 2014

im doing a program to store name, age, time and fitness. and i need to hold a table of 5 such records.can i do this?

#include <iostream>
using namespace std;
int name1, age1, time1, fitness1;
int name2, age2, time2, fitness2;
int name3, age3, time3, fitness3;
int name4, age4, time4, fitness4;
int name5, age5, time5, fitness5;

[code].....

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C/C++ :: Local Variable Declaration - While Loop Expression

Feb 3, 2013

I got the following lines of code from a book. The variable char c is being used here to demonstration local variable declaration.

  while(char c = cin.get() != 'q') {
    cout << c << " wasn't it" << endl;
    if(char x = c == 'a' || c == 'b')
      cout << "You typed a or b" << endl;
    else
      cout << "You typed " << x << endl;
  }

It compiles and runs. There are two issues when I try to run it.

1) It seems to loop through two times for every entry. If I insert cin.ignore() just before the closing bracket, it seems to work better.

2) the variable c does not seem to have the character I entered when examined in the if statement.

What is happening with the variable c inside the while loop scope?

Does c actually get initialized?

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C :: String Declaration As Global / Main Local Variable

Nov 14, 2013

When a declare a string e.g.

Code:
char str[30]; as a global variable, the srting is initialized to NULL.

But if I declare char str1[30] INSIDE main(), then the string has garbage inside.... Why this happens??

E.g. the following code snippet...

Code:
#include <stdio.h>
char str[50];
int main(){
char str1[50];

[Code] ....

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C :: How To Initialize Variable Word In Separate Statement From Its Declaration

Aug 7, 2013

I wrote the following program to initialize a string after the variables is declared, but it isn't working. A warning is given by the compiler, and the execution of the program shows a strange string. How do I initialize variable word in a separate statement from its declaration?

Code:

#include <stdio.h>
int main( void )
{
char word[20];
*word = "Hello";

printf( "The string is %s.
", word );
return 0;
}

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C++ :: Variable Declaration (const Pointer To SensorBase Object)?

Feb 19, 2015

I'm having to do a little c++ (coming from java) and don't understand the syntax of the following declaration

Code:
SensorBase* const sensor(mSensors[i]);

It looks like it's declaring a const pointer to a SensorBase object but I don't understand how that applies to sensor(mSensors[i]) which looks like a function??

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C++ :: Object And Classes - Declaration Of Variable Using User Defined Type

Mar 17, 2013

I am getting a compilation error from the code below. It is when i am naming a variable with my user defined type.

#include<iostream>
#include<cstring>
#include<cstdlib>
using namespace std;
class person {

[Code] .....

C:Dev-CppTRIAL.PASS.!!!.cpp In function `int main()':
66 C:Dev-CppTRIAL.PASS.!!!.cpp expected primary-expression before "p"
66 C:Dev-CppTRIAL.PASS.!!!.cpp expected `;' before "p"
74 C:Dev-CppTRIAL.PASS.!!!.cpp `p' undeclared (first use this function)
(Each undeclared identifier is reported only once for each function it appears in.)
83 C:Dev-CppTRIAL.PASS.!!!.cpp `X' undeclared (first use this function)

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C++ :: Template Definition Error

Apr 16, 2013

I have an issue converting VC++6 code to VC++ 2010. The following template function definition is not allowed by the new compiler:

template <> void AFXAPI DelElems <CBrush*> ( CPen** objects, int count ) {
for ( int i = 0; i < count; i++, objects++ )
if (*objects)
delete *objects;
}

All errors refer to the header of the template function:

- syntax error : '<'
- syntax error : missing ';' before '<'
- 'DelElems' : illegal use of type 'void'
- unrecognizable template declaration/definition

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C++ :: Multiple Definition Of Class?

Nov 18, 2013

I have a question about multiple definition of class LoaderException.

I have such code:

LevelLoader.hpp
#ifndef LEVELLOADER_HPP
#define LEVELLOADER_HPP

[Code]....

I found way around this, but I would like to know why it shows multiple declarations.

My solution is to declare this class in function body(void LoadLevel()), just before the throw statement. But why can't I define it inside my namespace, but outside function?

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C/C++ :: Getting Rid Of Multiple Definition Error

Dec 9, 2014

how to get this bug to go away and I am stressing about it. The project im working on simulates packet sending and receiving along with ROT13 encryption of the packets. The error lies within the .cpp file anywhere that I used IPHost.

header file

#ifndef IPHOST_H
#define IPHOST_H
#include <string>
#include <iostream>
class IPHost {
public:
//Default constructor defaults to 0.0.0.0

[code]...

error message:

In function 'ZStorSt13_Ios_OpenmodeS_':
line 11: multiple definition of 'IPHost::IPHost()'
line 11: first defined here

**this error repeats for every line in the .cpp in which IPHost is used.

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C++ :: Definition Of Const Strings In CPP Files

Mar 14, 2013

What is the best way to define const strings when there are separate header and source files?

For example, I have a header that only declare some enums. In that same header I would like to add string representations of those enums so that I can print them easily i.e string_representation[my_enum] for debug and error printing and so on.

If I define them in the header file, I will get a linker error for multiple definitions. If I remove the definition, then I can not define it in the source file.

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C++ :: Scope Of Inline Function Definition

Dec 11, 2013

I have observed that inline functions can not be prototyped. example:

.cpp file:

inline void whatever() {
cout<< "this is inline"<< endl;
}

.h file, prototype
inline void whatever(); //would ask for a definition

Because of this, I have have just made functions that are used in only 1 .cpp file (ever) inlined, to make it more efficient (and it has demonstrated that it is more efficient). It's worked out fine so far, but what about the scope of the definition??

Since an inline function is like a templated function, in that it can't be prototyped, how are name conflicts resolved, and what is the best practice for writing inline functions??

Example of a conflict:

//in some arbitrary header...
void do_somthing();
//in .cpp file that inlcudes the header...
inline void do_somthing() {
cout<< "I'm doing somthing!!"<< endl;
} int main() {
do_somthing(); //which one?? it compiles fine though!!
return 0;
}

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C++ :: Undefined Reference To Class Definition

Aug 4, 2013

I have successfully built OGDF under directory undefined reference to /home/vijay13/Downloads/OGDF-snapshot/

I have following code in test.cpp under directory /home/vijay13/Downloads/ :

#include <ogdf/basic/Graph.h>
#include <ogdf/fileformats/GraphIO.h>
#include <ogdf/basic/graph_generators.h>
#include <ogdf/layered/DfsAcyclicSubgraph.h>
using namespace ogdf;

[Code] .....

while compiling as following :

vijay13@ubuntu:~/Downloads$ g++ -o test test.cpp -I /home/vijay13/Downloads/OGDF-snapshot/include/

I am getting following error:

vijay13@ubuntu:~/Downloads$ g++ -o test test.cpp -I /home/vijay13/Downloads/OGDF-snapshot/include/
/tmp/ccPE8nCu.o: In function `main':
test.cpp:(.text+0x26): undefined reference to `ogdf::Graph::Graph()' ...................... so on

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C# :: Definition Errors After Changing Name Of Class

Jan 31, 2014

I changed the name of my Invoice class to 'Application' and then it generated errors such as follows

Error9'Invoice.Invoice' does not contain a definition for 'Documents' and no extension method 'Documents' accepting a first argument of type 'Invoice.Invoice' could be found (are you missing a using directive or an assembly reference?)c:userskeildocumentsvisual studio 2013projectsinvoiceinvoicewritefile.cs1840Invoice

Error3'Invoice.Invoice' does not contain a definition for 'Run'C:UsersKeilDocumentsVisual Studio 2013ProjectsInvoiceInvoiceProgram.cs1921Invoice

I have added my classes here, lso I have added the sln to this post.

using System;
using System.Collections.Generic;
using System.ComponentModel;

[Code].....

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C Sharp :: No Definition For Fill (WinForms)

Feb 13, 2013

I'm working on a personal project, where I have a database (SQLite) and a dataGridView. Now This is what I have:

 public Form1() {
            DataSet ds = new DataSet();
            SqlConnection connection = new SqlConnection(@"Data Source=testingsql2.s3db");
            SqlDataAdapter SQLda = new SqlDataAdapter("Select * from User", connection);
            SqlCommandBuilder SQLcb = new SqlCommandBuilder(SQLda);
            dataGridView1.Fill(ds, "User"); //Error here
            dataGridView1.DataSource = ds;
            dataGridView1.DataMember = "User";
        }

I've marked where I get the error.

And the Error description:
Error    1    'System.Windows.Forms.DataGridView' does not contain a definition for 'Fill' and no extension method 
'Fill' accepting a first argument of type 'System.Windows.Forms.DataGridView' could be found 
(are you missing a using directive or an assembly reference?)

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C++ :: Move Constructor In Class Definition?

May 5, 2013

I am unable to understand how a move constructor works in this example of code. If someone could break down the process of what is taking place and explain to me on why to use a move constructor.

Code:
class MyString {
MyString(MyString&& MoveSource) {
if( MoveSource.Buffer != NULL ) {
Buffer = MoveSource.Buffer; // take ownership i.e. 'move'
MoveSource.Buffer = NULL; // set the move source to NULL i.e. free it
}
}
};

Example from "SamsTeachYourself: C++ in One Hour a Day"

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