C++ :: Header File Namespace
May 19, 2013Can we put using namespace std; in a header file? Someone told me not to do it, but I don't know why...
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C++ :: Two Header Files - How To Use Namespace
May 2, 2013I have two header files, A, B.
A.h
namespace test {
struct info
{
int a;
}
}
B.h
#include "A.h"
int main {
test::info.a = 10;
}
However, it has an error. I don't quite understand how to use namespace.
C++ :: Generate Report Based On Input Received From Text File - User Defined Namespace
Nov 11, 2014Write a program to generate a report based on input received from a text file. Suppose the input text file student_status.txt contains the student’s name (lastName, firstName middleName), id, number of credits earned as follows :
Doe, John K.
3460 25
Andrews, Susan S.
3987 72
Monroe, Marylin
2298 87
Gaston, Arthur C.
2894 110
Generate the output in the following format :
John K. Doe 3460 25 Freshman
Susan S. Andrews 3987 40 Sophomore
Marylin Monroe 2298 87 Junior
Arthur C. Gaston 2894 110 Senior
The program must be written to use the enum class_level :
enum class_level {FRESHMAN, SOPHOMORE, JUNIOR, SENIOR } ;
and define two namespace globalTypes (tys and fys) for the function :
class_level deriveClassLevel(int num_of_credits) ;
The function deriveClassLevel should derive the class_level of the student based on the number of credits earned.
The first namespace globalType tys should derive the class level based on a two year school policy.
and the second namespace globalType fys should derive the class level based on a four year school policy.
Four Year School Policy:
Freshman 0-29 creditsSophomore 30-59 credits
Junior 60-89 creditsSenior 90 or more credits
Two Year School Policy:
Freshman 0-29 creditsSophomore 30 or more credits
NOTE : use ignore() function with ifstream objects whenever you want to ignore the newline character.
For example :
ifstream transferSchoolFile ;
transferSchoolFile.open("student_status.txt", ios::in);
while( !transferSchoolFile.eof()) {
getline(transferSchoolFile,name) ;
transferSchoolFile >> id >> credits;
transferSchoolFile.ignore(); //Used here to ignore the newline character.
….
}
I did this in parts so I got it working with a four year criteria without the user defined name spaces.
include <iostream>
#include <fstream>
#include <string>
using namespace std;
enum class_level { FRESHMAN, SOPHOMORE, JUNIOR, SENIOR };
[Code] ....
So that worked fine then I tried with name spaces -
#include <iostream>
#include <fstream>
#include <string>
using namespace std;
enum class_level { FRESHMAN, SOPHOMORE, JUNIOR, SENIOR };
class_level classLevel;
[Code] ....
I know I have some stuff to mess around with but I am currently stuck with two errors, first -
Error1error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartupC:UsersstephenDocumentsVisual Studio 2013ProjectsinputConsoleApplication1MSVCRTD.lib(crtexe.obj)ConsoleApplication1
then -
Error2error LNK1120: 1 unresolved externalsC:UsersstephenDocumentsVisual Studio 2013ProjectsinputDebugConsoleApplication1.exeConsoleApplication1
C/C++ :: Generate Report Based On Input Received From Text File - User Defined Namespace
Nov 11, 2014Program Description: Write a program to generate a report based on input received from a text file. Suppose the input text file student_status.txt contains the student's name (lastName, firstName middleName), id, number of credits earned as follows :
Doe, John K.
3460 25
Andrews, Susan S.
3987 72
Monroe, Marylin
2298 87
Gaston, Arthur C.
2894 110
Generate the output in the following format :
John K. Doe 3460 25 Freshman
Susan S. Andrews 3987 40 Sophomore
Marylin Monroe 2298 87 Junior
Arthur C. Gaston 2894 110 Senior
The program must be written to use the enum class_level :
enum class_level {FRESHMAN, SOPHOMORE, JUNIOR, SENIOR } ;
and define two namespace globalTypes (tys and fys) for the function :
class_level deriveClassLevel(int num_of_credits) ;
The function deriveClassLevel should derive the class_level of the student based on the number of credits earned.
The first namespace globalType tys should derive the class level based on a two year school policy.
and the second namespace globalType fys should derive the class level based on a four year school policy.
Four Year School Policy:
Freshman 0-29 creditsSophomore 30-59 credits
Junior 60-89 creditsSenior 90 or more credits
Two Year School Policy:
Freshman 0-29 creditsSophomore 30 or more credits
NOTE : use ignore() function with ifstream objects whenever you want to ignore the newline character. For example :
ifstream transferSchoolFile ;
transferSchoolFile.open("student_status.txt", ios::in);
while( !transferSchoolFile.eof()) {
getline(transferSchoolFile,name) ;
transferSchoolFile >> id >> credits;
[Code] ....
I know I have some stuff to mess around with but I am currently stuck with two errors, first -
Error1error LNK2019: unresolved external symbol _main referenced in function ___tmainCRTStartupC:UsersstephenDocumentsVisual Studio 2013ProjectsinputConsoleApplication1MSVCRTD.lib(crtexe.obj)ConsoleApplication1
then -
Error2error LNK1120: 1 unresolved externalsC:UsersstephenDocumentsVisual Studio 2013ProjectsinputDebugConsoleApplication1.exeConsoleApplication1
C++ :: Implementation File Versus Header File - Eclipse Giving Errors
Feb 10, 2013I have written my program and it works when I keep everything in the header files, and then have my main. I am now splitting them up into implementation files, but Eclipse keeps giving me errors. It gives me error at every opening brace of the constructor and functions. It says on all of them "Redefinition of (name of constructor or method), Previously declared here." What am I doing wrong, because it works in the header file?
#include "KeyValuePair.h"
template<typename Key,typename Value>
KeyValuePair<Key,Value>::KeyValuePair()
[Code] .....
C++ :: Overloaded Operator Defined In Header File - Gives Error In CPP File Of Class
Apr 12, 2014I am working on an assignment in which i have to perform th following task
myClass itsObject1,itsObject2;
itsObject2=5000+itsObject1;
I have defined overloaded operator as follows in the header file but in the cpp file of the class it gives error.
friend vli &vli::operator + (int &a,vli &obj);
How to define it in cpp file of my class?
C++ :: Splitting Template Class To Header H File And Implementation CPP File
Sep 12, 2014What is the right syntax for implementing the .cpp of a template class?
Consider this LinkedList.h file:
Code: #include<iostream>
#include"Iterator.h"
template <class T>
class LinkedList {
[Code] ....
How should the implementation for the LinkedList constructor, for example, should look like in the LinkedList.cpp file?
I tried this:
Code: #include "LinkedList.h"
template <class T>
LinkedList<T>::LinkedList<T>() {
// constructor
}
LinkedList<T>::~LinkedList<T>() {
// destructor
}
But the compiler wouldn't accept it.
C++ :: How To Declare Class As Forward In Header File - Regular Use In CPP File
Jan 17, 2015lets say we have a valid class with full implementation, X. can this class be declared as forward in Y header file:
Code: class X;
class Y{
X* m_X;
}
but still be used as regular in the cpp file?
Code:
#include "Y.h"
#incldue "X.h"
T Y::function(){
m_X->doSomething();
}
visual studio prevents me from doing it , I wonder if the standard also says so.
C :: How To Share Variable Value From One Source File To Other Header File
Dec 11, 2014I wanted to share the value of a variable from Sender Program to Receive after program and want to calculate difference between send and receive. After studying Header file concept I program following three.
Now I am struck. How to to compile? I link all these file. I used following method:
Code:
gcc Sender.c -o Sender Sender.h
gcc Receiver.c -o Receiver Student.h
Then I run Sender and after that Receiver.I per my knowledge, Receiver should give difference but it gives error :
Code:
Receiver.c: In function "main":
Receiver.c:10:42: error: "Send" undeclared (first use in this function)
printf(" Total Receive is %d
",Receive-Send);
Code:
Sender.c
#include <stdio.h>
int Send ;
void main(){
[Code] ....
C++ :: Invoke Enum Class From Header File To Cpp File
May 21, 2014I have been working a project in C++. I have TTTMain.cpp file that has all the function calls, TTTFuntions.cpp that has all the functions, I have TTT.h file that has all the prototypes and variables and additionally I have Winner.h that has enum class Winner declaration in it. Here is my block of codes:
Winner.h file:
#ifndef winner
#define winner
enum class Winner {
[Code]....
My question is when I compile this gives me error on
Winner gameSquares[] = { Empty, Empty,Empty, Empty, Empty, Empty, Empty, Empty, Empty };
with saying "invalid use of non-static data data member" and It says "Empty was not declared in this scope."
I know calling enum is very very trick.
C++ :: Missing Templates File CPP And Header File
Jul 29, 2013I am beginner in c++ language. i'm use visual studio 2010 ultimate. the problem is i can't add c++ file(.cpp) and header file(.h).
Here the screenshot : [URL] ....
C++ :: Header File Automatically Linking CPP File?
Dec 27, 2014I made my header file. If cpp file with definitions is in project compiler knows it has to be linked, but if it's not compiler doesn't know. If I include standard library or boost I don't have to manually link cpps. How to do so including my header automatically links cpp? Maybe problem is with something else?I use VS 2013.
View 4 Replies View RelatedC++ :: Source File And Header File Are Not Compiled Together
Jan 30, 2013My socket.cpp program got error. it showed "socket.h: no such file or directory". I had put my header file (socket.h) in the same place with my source file.
View 1 Replies View RelatedC++ :: What Is Namespace STD
Jun 10, 2014i know using namespace std; is important to wite as it contain cout,cin,etc........but is that namespace std is contained inside iostream header file OR iostream header file is contained inside namespace std ......
View 1 Replies View RelatedC :: Defines And Header File
Mar 23, 20131. Write a program the calculates the volume of a sphere.
Use a define to set Pi to 3.14 and a macro for the formula for the sphere.
V = 4/3PiR3.
In main ask for the radius (R).
Pass it to a function where you calculate the volume and return it to main and print the volume in main.
Use float values. (Save this program as you'll need it later.)
Code:
#include<stdio.h>
void fun (float);
main()
[Code].....
C++ :: Read A File With Header?
Jun 4, 2013I need read a file with header and I wanna print the file in output. How can I do that? I tried but not work..
#include<iostream>
#include<fstream>
using namespace std;
int main()
{
[Code]....
C++ :: How To Modify A Header Of Any File
Jul 24, 2013All i want to do is modify a header of a file(.exe file). I just want to do if for fun and see what I can do with it.
View 3 Replies View RelatedC++ :: Header File Inclusions
Apr 11, 2013I have a class Myclass (for the sake of the example). I have a header file 'space.h', which is following:
#include "Myclass.h"
struct Files {Myclass* new_object, int number};
But turns out in the Myclass.h, I need the struct Files, like so:void function(vector<Files> arrangement);
So I would have to include "space.h" in the Myclass.h, but this way there's going to be a double definition of struct Files, since Myclass.h includes space.h and space.h includes Myclass.h.
C++ :: How To Create Header File
Oct 22, 2013Any good/solid example on how to create a header file?
View 2 Replies View RelatedC++ :: How To Define Own Header File
Jan 16, 2013I have written code for a timer. with everything and i want to include this so i dont need to write or copy the reqd code each time. how do i do this?
View 9 Replies View RelatedC++ :: How To Use Header File For A Class
Sep 21, 2014I wrote a simple date class and could not get it to work until I put all the code in main(). Then it worked like a charm. I have not been able to create a separate .cpp file and get it to work with my existing main().
I tried to follow [URL] which is a closed article, with no success. I tried every combination I could think of and was unable to compile without error. (Linux Mint 17,code::blocks 13.12, G++ 4.8.2). I did finally get it to work by putting *all* my code in the .h file and #including the .h file (and nothing else) in the .cpp file. This is not how it's supposed to work.
This is unbelievable! I just tried this on another computer, same OS same version of Code::Blocks and G++.
C/C++ :: Compiling With One Header File?
Oct 21, 2014I am trying to compile two programs using the same header file and definitions. makefile part to make this work.
================================
My headerfile looks like this:
#ifdef ONE
void hello(int s);
#else
[Code]....
How can I include the flag -DONE in my makefile so that
it includes void hello(int s); for "one" and
int pin;
int verification(char* name);
for "two"
C/C++ :: How To Make A Header File
Apr 16, 2014Here is my code
#include<msp430.h>
#include<stdio.h>
#include "contiki.h"
#include "isr_compat.h"
#include "string.h"
char dest[20]; //Global Variable
void uart0_send_data() {
[Code] ....
This code is used to transmit and receive the data. My only concern as of now is to create a header file for uart0_init() function.
C++ :: Dislike Using Namespace Std?
May 4, 2013It seems as though more experienced programmers tend to write code with std::cout, std::string, etc., whereas less experienced programmers always write using namespace std;. They also tend to assume that, in code snips, it is already included.
Why is this? If it's a dislike, what's the problem with it? As stated in the namespaces tutorial on this site, a namespace can be overridden if need be. Is it the case that you have written your own namespaces? Or that you so seldom use things like the STL and stdin/out that it just isn't necessary?
C/C++ :: How To Run A Program Using Namespace
Mar 18, 2015#include<iostream>
#include<conio>
nmaespace num {
void disp(int x) {
[Code] ....
C++ :: Include Function From Header File?
Feb 21, 2013I am trying to include a function from a header file named headerfunt.h . The code of my header file is
Code:
#ifndef HEADERFUNCT_H_INCLUDED
#define HEADERFUNCT_H_INCLUDED
#include <iostream>
[Code]....
But, while compiling it says abs was not declared... I have included the file.