Sometimes <iostream> found and compiles and sometimes not!

BOHICAMAN

Here's part of the coding from the "bad" program
@// A program that uses the Vehicle CLASS.

#include <iostream>

using namespace std;

//Declare the Vehicle Class.
class Vehicle {
public:
int passengers; //number of passengers.
int fuelcap; //fuel capacity.
int mpg; //fuel consumption in mpg.
};

int main() /The main() function creates 2 instances of Vehicle called minivan and sportscar.
The code within main() accesses the instances of variables associated
with minivan & sportscar, assigning them values and then using those variables.
The code inside main() can access the members of Vehicle because they add_reference
declared public./

{@

BOHICAMAN

And part from the "good one"

@/*

A simple program to provide Help with functions.
Project 3-3 Pg 111 is herein revised to Project HelpClass Pg 295 (C++ A Beginner's Guide) with addition of USER ID function
from Masteryhecks 8
This Help System now processes multiple requests.
This main.cpp adds a User ID function to the original program on Pg 295
*/

#include <iostream>
using namespace std;

                                        // A class that encapsulates a help system. This is a function only class.

class Help {
int userID;

public:
Help(int id) { userID = id; } //Sert up User ID

~Help() { cout << "\n Terminating help for # " <<
                  userID << ".\n\n";}
int getID() { return userID; }

void helpon(char what);
void showmenu();
bool isvalid(char ch);

};
//Display help information.

void Help::helpon(char what)
{
switch (what)
{
  case '1' :
   cout << " The if:\n\n" ;
   cout << " if(condition) statement; /n" ;
   cout << " else statement; \n" ;
    break ;@

andreyc

Are there any differences in the .pro files except of different source files ?

BOHICAMAN

Nope, identical.

BOHICAMAN

Bad .pro
@
#-------------------------------------------------

Project created by QtCreator 2014-06-26T11:23:54

#-------------------------------------------------

QT += core

QT -= gui

TARGET = VehicleClass
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app

SOURCES += main.cpp
@

Good .pro
@
#-------------------------------------------------

Project created by QtCreator 2014-06-26T14:16:26

#-------------------------------------------------

QT += core

QT -= gui

TARGET = HelpClass
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app

SOURCES += main.cpp
@

andreyc

What if you try to run "Clean", "Run qmake", and "Rebuild" for both projects.

BOHICAMAN

Didn't work. Now neither compiles. I get that same error message for both. No idea what's wrong!!

andreyc

Do you have iostream file on your computer ?

[EDIT] What version of Qt do you use ?

BOHICAMAN

Yea, looked it up and it's in the "include" folder of MSVC2013

Qt 5.3.0 using QtCreator 3.1.1

It's been working fine till today. Haven't added any new programs, updates, etc. Nothings changed that I know of. Also checked and no viruses according to Norton!

BOHICAMAN

Also, the "good" program was re-compiling until just now. Beats me what's going on!!

BOHICAMAN

I've got to head to a meeting now. I really appreciate all your help and assistance!! If you think of anything else, I'll be checking in later. Again, thanks!!

Bob

andreyc

Try to add to you .pro file
@
INCLUDEPATH += C:/path/to/MSVC2013/include
DEPENDPATH += C:/path/to/MSVC2013/include
@

BOHICAMAN

Nope, didn't work.

BOHICAMAN

I put in a few other programs I wrote that worked and I re-built them tonight. After the rebuild, same problem. I'm thinking it's the compiler. Nothing in the coding changed.

andreyc

Have you changed the compiler recently, may some Windows updates ?
If you have Visual Studio, try to create simple Hello World in VS and compile it.
Compare compiler flags.

BOHICAMAN

Had problem with VS 2013. Deleted it and now re-downloading. Will have to wait till tomorrow to try it. Thanks!

BOHICAMAN

Compiler was the problem!! After re-downloading it, I ran the programs again and all compiled and ran perfectly.

Andreyc, Thanks for the help!!

Bob

Hareen Laks

I just changed the Mingw version in kit. Then my problem solved.