C :: Compiling Sudoku Program - Declare Constant Instances As Global Variables

Sep 18, 2013

I am trying to compile a c program for sudoku. I have declare const instances as global variables, but when i try to compile the code it says that my declarations are not constant, here is some of the code.

#include <stdio.h>
#include <assert.h>

const int GRIDSIZE = 3;
const int GRID_SQUARED = GRIDSIZE * GRIDSIZE; //this line
const int ALL_VALUES = (1<<GRID_SQUARED)-1; //and this give//the error
int board [GRID_SQUARED][GRID_SQUARED];

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C/C++ :: Cannot Add New Variables To Program - Crashes After Compiling

Oct 24, 2014

Problem: When I add a new variable to complete my program, it crashes. I have tried tracing where the problem is but it leads to adding new variables

Purpose of program: Every 2 lines of the input file belong to 1 participant. The line with decimals include times a person has run miles. While the second line of each participant are integers that indicate the best sets from workouts the participant had done.

so an example of the output

Participant #1
Cardio Workouts:
Best Time:
Worst Time:
Average Time:
Weight Workouts:
Most Sets:
Least Sets:
Average Sets:

Participant #2
...

Why my program is crashing

#include <stdio.h>
int main () {
// Stats Col0=BestTime Col1=WorstTime col2=mostSets col3=leastSets Col4=Average_time Col5=Average_sets
float chart[20][12], stats[10][6], best_time=100, worst_time=0, most_sets=0, least_sets=100, avg_time, avg_sets, sum;
int i, j;
int p=0;

[Code] .....

Attached File(s)
input1.txt (817bytes)

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C/C++ :: Create Local Instances Of A Global Variable?

Oct 4, 2012

is it possible to have a global variable pointing to a different address depending on the thread?

Imagine one would like to use threads with the loop:

for (i=0;i<n;i++){
globalPointerVariable=getAddress(i);
DoThingsUsingThe_globalPointerVariable();
}

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C :: Declare Global Array And Then Use It In Few Functions

Jan 22, 2015

I want to declare a global array and then use it in a few functions. When I want to assign any number to that array I face with this error:

Code:
a.c:11:6: error: expected expression before ']' token
n[]={1,2,3,4,5};
^

The code is:
#include <stdio.h>
int n[5]; // I need to define the array here to be global
int main () {
n[]={1,2,3,4,5};

[Code] .....

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C/C++ :: How To Declare Global Variable In Structure

Apr 28, 2015

I am getting this error while trying to compile my program:

It says that my variables "nome, cognome, eta..etc" are being used for the first time in my "inserisci" function.

I tought that I could just declare them as global in my structure like I did in my code, but apparently this doesn't work.

Do I really need to declare them again outside of my structure? Isn't there another way?

Here is my code:

#include <stdio.h>
#include "readline.h"
void inserisci(void);
struct impiegato{
char nome[20];
char cognome[20];
int eta;

[code].....

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C++ :: Bigint - Global Constant Size

Sep 14, 2013

I am making a class called "bigint" and i have to have a global constant "size". How do I make that global "size" the size of bigint? If "size" is an array and "bigint" is an object how does that work? Heres the instructions for the program..

Requirements:
-You must use the class construct to implement your ADT.
-The ADT bigint need only work for positive numbers.
-Use a global constant value for the maximum size of the bigint that is, a constant sized array.

Implementation:
-The size of the bigint must be specified by a global constant
-A method (constructor) to initialize a bigint to zero.
-A method (constructor) to initialize a bigint to an int value you provide [0, maxint]. Example: bigint(128).
-A method (constructor) to initialize a bigint to a char[] you provide. You can assume what is provided is a valid bigint. Example: bigint("299793").
-A method to write a bigint that prints at most 60 digits per line.
-A method to compare if two bigints are equal. It should return a bool - true if equal and false otherwise.

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C++ :: How To Declare Array With Constant Size Inside Of Class

Jul 29, 2013

I wanted to add that the template argument is needed because its a "special case" but if that doesn't work what would be the next best way to solve this problem. I want to be able to declare the const size of the array outside the class far removed from it actually. I'm actually going off this page

[URL] .....

Heres the code

#include <iostream>
template <int F>
class C
{

[Code]....

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C++ :: Read In Lines From A File / Store In Variables Then Construct Instances Of Class

Aug 22, 2013

I can't get my code to compile, i need to read in lines from a file and store them in variables. Then i have to construct instances of my class for how many lines there are in the file and take those variables into them.

I'm getting this error :

"a2.cpp:40: error: cannot convert `Employee' to `Employee*' in assignment"

#include<iostream>
#include<string>
#include<fstream>
void displayInfo();
using namespace std;
class Employee{

[Code] .....

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C :: Use Pointers Instead Of Global Variables?

Oct 15, 2014

I have made an application and I have basically solved everything. But the only problem is that I am using global variables because it felt like the smoothest, so my program is built on it.

But now I've read around and I understand that you should not use these(?). Do you think pointers is the best think to use instead?I have previously declared my board array and some variables as global and I want them in alot of functions.I have read and understand the procedure for the use of pointers so I can use my int's in the other functions by doing like this? Code: #include <stdio.h>

int justprint();
int main()
{
int Row = 2;
int Column = 2;
int *pRow = &Row;
int *pColumn = &Column;
[code]...

But how do I do it with an array like this one? If I declare it in the main function, and then want to use it in other functions.Or are there better, easier solutions?

Code: char game[3][3]={{0,0}};

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C++ :: Access EXE Global Variables From DLL

Jun 25, 2013

On linux, I can compile DLLs (shared objects) as well as executables that use them. I can even access globals and classes that are defined in the EXE from the DLL, and vice versa, simply with the 'export' keyword. flawlessly.

The Problem: But on Windows (using MinGW), no matter what I do, I'm completely unable to access global variables which defined in the EXE, from the DLL. On Linux, this is no sweat, but what's Windows' problem?

I also need to extend classes in the dll with base class method definitions defined in the exe.

Ive heard that on Windows, you need to use declspec(dllimport) and declspec(dllexport). I can compile with CygWin+MinGW/g++4.5.3 as well as "Pure Windows" with MinGW/g++4.7.2 *without* the declspecs. So what's the decljunk for? Is this really just something for MSVC or other compilers?

Here's some Windows code to show what the problem is. The DLL's global variable is accessible to the EXE just fine, but the EXE's global variable is not accessible to the DLL - compilation complains it is an undefined reference.

main.cpp
#include "myLib.h"
#include <stdio.h>
int exe;

[Code].....

edit: I tried using --enable-runtime-pseudo-reloc --allow-shlib-undefined options when compiling the DLL and G++ complains that --allow-shlib-undefined is an unrecognized option.

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C++ :: Setup Global Variables

Feb 23, 2015

I am using VS2010 to develop an app which includes several windows forms that I am trying to set up global variables for, and I am getting a few errors like:

LNK2005: "wchar_t *dsn"...already defined in ....obj

I have a header file (externals.h) with:
#ifndef MY_GLOBALS_H
#define MY_GLOBALS_H
extern long dbg;
extern wchar_t dsn[50];
extern wchar_t u[30];
extern wchar_t p[30];
#endif

and 2 different forms, each with different namespaces, but both including the above header (#include "externals.h").One of the form .h files defines the values for these externally declared variables like this: namespace PWValidationTools{

wchar_t dsn[50] =_T("MDOTProjectWise");
wchar_t u[30]=_T("api_admin");
wchar_t p[30]=_T("proce55");
long dbg = 1;

public ref class ValidationSetupForm : public System::Windows::Forms::Form {
}

The other form file only uses these variables, never defines them.I am getting the above LNK2005 error only for the variables declared as wchar_t, not the "long" one. why I'm getting the link errors only for the wchar_t variables.

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C++ :: Global Variables For Multiple CPP Files

Jan 19, 2014

I am trying to get variables that are global to multiple files. I have mananged to make constant variables that are global but maybe not in the best way. In the header i have the constant variables being defined:

const int variable_Name = 5;

And the cpp file:

#include <iostream>
using namespace std;
#include "vars.h"
int main ( ) {
cout << variable_Name<< endl;
system ("pause");
return 0;
}

Is there a better way to do this and to make the variables able to be changed within the cpp files.

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C++ :: Using Global Variables In Static Library

Jul 22, 2014

Is it possible to use & change global variables in a Static Library? For example:

I declare a
bool test = true;
globally.

Then later in an exported function If the user wants, he can set that test to false. So the program later when checks test if it's true, will notice that it's not true, since one of my function changed it.

Is it right?

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C++ :: Declare Static Variables In Header File

Oct 15, 2013

I read in another forum that it is bad practice to declare static variables in a header file? Is that true and if so why.

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C/C++ :: Main Function Can Only Declare Variables And Functions

Mar 9, 2015

I need making my main function to run while not having any if or for statements. It can only declare variables and functions. Since my main function has command line arguments, how to so.

// This program counts all the words in a given file.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(int argc, char* argv[]) {
FILE* txtFile = NULL; // File Pointer
char str[1000000];

[Code] ....

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C++ :: Passing Data Between Threads Without Using Global Variables

Nov 6, 2013

I have a main thread and a worker thread. How do i pass data between them when both are already running without using global variables?

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C/C++ :: Why Implicit Int Approach Taken With No Specifier Only For Global Variables

Sep 22, 2013

I realize that implicit int rule was removed in C99 but gcc still takes this approach by default. I wonder why this happens:

bbb = 5; // legal
int main(void) {
aaa = 10; // illegal
auto aaa = 10 // legal

Inside function a specifier is needed. Error message with no specifier used is:

error: ‘aaa’ undeclared (first use in this function)

Is this because of linkage - bbb variable has an external linkage so compiler knows that we are defining a variable here while inside mean() we need to show compiler that aaa is defined right here, it does not come from external functions?

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Visual C++ :: Static Variables Local Or Global?

Mar 10, 2014

I came across the following code today and I was a bit surprised that it worked:-

Code:
std::string func_A () {
static std::string x;
if (!x.empty())
return x;

[Code] ....

I've simplified things slightly - but the basic point is that both functions are in the same source file and they both have a static std::string called 'x'. Being static, I guess they aren't (strictly) local variables. So how does the compiler know that they're different entities? Does it encode their signatures using the function name or something like that? If I call each function separately I do seem to get the correct string...

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C :: Need Of External Keyword In Order To Declare Variables Globally

Jan 30, 2014

I think there is no always need of keyword extern in order to declare variables globally. Is it right?

For example I can declare a variable globally in one file and use it in some other provided that I have included the last one file ( that has the declaration of the variable of course) and compile these files together :

gcc -c f1.c f2.c for example

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C :: Adding Constant To Multiple Variables

May 20, 2013

Instead of using:

Code:
x=x+k
y=y+k
z=z+k

Is there a more elegant method of adding the same constant to many variables?

Something like: Code: (x, y, z) = (x, y, z) + k ??

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C :: Program To Find Out Solution Of Sudoku Puzzle?

Jan 28, 2014

I'm doing a program about finding out the solution of a sudoku puzzle. I've been thinking about how I'm going to check every box of the small 3x3's. What would be the best and most efficient way of doing that?

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C :: How To Make Main Function Only Allowed To Declare Variables And Functions

Mar 6, 2015

So I need to make a main function have no if/for/etc. statements so I need to move it to another function and call it in main. The problem is that it's a command line argument function so I'm confused on how it works. Here's an example:

Code:

#include <stdio.h>
int main(int argc, char* argv[])
{
printf("The program name %s", argv[0]);
if (argc == 2) {
printf("Argument supplied is %s", argv[1]); }
else if (argc > 2) {
printf("Too many arguments");}
else {
printf("One argument");}
}

How can i make this into two functions with main only declaring variables and calling other functions?

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C++ :: FTP Program Compiling A File?

Mar 28, 2013

I have a FTP server, client program and thus I can easily transfer files, however what I want is to modify the program such that server receives a c/c++ file, compiles the output, and sends a text file back to the client containing the output. The program should also take note that errors are also transferred.

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C++ :: Program Got Crashed On Compiling?

Jun 25, 2014

I'm working for implementing the binary search tree .Everything looks fine but on compiling the code , the program got crashed .

code :

#include<iostream>
#include<stdio.h>
using namespace std;

[Code]......

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C :: Virus Alert While Compiling Program

Jul 7, 2014

While I was trying to compile simple c program, I saw this virus alert:

Win64:Evo-gen [Susp]