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My C++ Question Thread

 
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AndrewMan
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PostPosted: Wed Sep 17, 2008 7:56 pm    Post subject: My C++ Question Thread Reply with quote
Well, I started to learn C++ today.

Obviously i'm starting with consoles for many reasons, and than moving on to Win32 API.

I will post all my questions here, so I dont end up making like 50 threads...

1st Question: Why does my program open than close? - SOLVED

My source:
Code:
 //my first program in C++, Sep. 17, 2008

#include <iostream>
using namespace std;

int main()

{
   cout << "Hello World";
   return 0;
}


2nd Question: When I use 'int' instead of 'double' my answer is different. -SOLVED
Code:
// Defined Constants: Calculating Circumference. Sep 18, 2008.


#include <iostream>
using namespace std;

// Define our constants:
#define PI 3.14159
#define NEWLINE '\n'

int main()
{
   double r=5.0; //radius
   double circle;

   circle = 2*PI *r;
   cout << circle;
   cout << NEWLINE;

   cin.sync();
   cin.ignore();
   return 0;
}

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Last edited by AndrewMan on Thu Sep 18, 2008 6:24 pm; edited 6 times in total
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Polynomial
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PostPosted: Wed Sep 17, 2008 8:01 pm    Post subject: Reply with quote
That's what a console application does.

Start -> Run...
Type in cmd
Navigate to your directory using "cd <dir>", for example:
cd "C:\Documents\C++ Projects\Hello World\bin"
Type in the name of the executable and press enter. The output should appear Smile

If you want to get round this, cin a single char at the end of your main method. The application will halt at the end, waiting for user input. When the user presses any key, the application will close.
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oib111
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PostPosted: Wed Sep 17, 2008 8:04 pm    Post subject: Reply with quote
It's because you are instantly returning (in this case closing your program) right after outputting your text. To pause your program put these two lines of code before return 0.

Code:

cin.sync();
cin.ignore();

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AndrewMan
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PostPosted: Wed Sep 17, 2008 9:07 pm    Post subject: Reply with quote
Thanks guys, more question to come tomorrow as I start working with user input.
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&Vage
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PostPosted: Wed Sep 17, 2008 9:50 pm    Post subject: Reply with quote
Use getchar(); or system("pause");
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sponge
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PostPosted: Wed Sep 17, 2008 9:59 pm    Post subject: Reply with quote
_void_ wrote:
Use getchar(); or system("pause");
No, bad.
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Overload
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PostPosted: Wed Sep 17, 2008 10:24 pm    Post subject: Reply with quote
_void_ wrote:
Use getchar(); or system("pause");


rofl, probably some of the worst advice i've seen in a long time on CEF.
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Noz3001
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PostPosted: Thu Sep 18, 2008 2:32 am    Post subject: Reply with quote
Overload wrote:
_void_ wrote:
Use getchar(); or system("pause");


rofl, probably some of the worst advice i've seen in a long time on CEF.


It's void, what'd you expect? ^_^.

Heres some stuff so you dont even need to ask for it:

Code:
void _inline pause(void) {
   std::cin.sync(); std::cin.ignore();
}


Code:
void _inline mincls(void) {
   COORD start = {0, 0};
   std::cout.fill(' ');
   SetConsoleCursorPosition( GetStdHandle(STD_OUTPUT_HANDLE), start );
}


Code:
void fullcls(void) {
   HANDLE hStdOut = GetStdHandle(STD_OUTPUT_HANDLE);
   COORD coord = {0, 0}; DWORD count;

   CONSOLE_SCREEN_BUFFER_INFO csbi;
   GetConsoleScreenBufferInfo(hStdOut, &csbi);

   FillConsoleOutputCharacter(hStdOut, ' ', csbi.dwSize.X * csbi.dwSize.Y, coord, &count);
   SetConsoleCursorPosition(hStdOut, coord);
}


Function names pretty much tell you everything.
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AndrewMan
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PostPosted: Thu Sep 18, 2008 6:04 pm    Post subject: Reply with quote
Thanks sooo much for the help guys, you all so damn helpful.

Edit: New question added.
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HalfPrime
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PostPosted: Thu Sep 18, 2008 6:09 pm    Post subject: Reply with quote
int does not support decimals. you can use it, but it wouldn't be as accurate as float or double.
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AndrewMan
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PostPosted: Thu Sep 18, 2008 6:15 pm    Post subject: Reply with quote
HalfPrime wrote:
int does not support decimals. you can use it, but it wouldn't be as accurate as float or double.


Ahh I see, no wonder why my answer had no decimals.

Thanks HalfPrime Very Happy
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&Vage
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PostPosted: Thu Sep 18, 2008 6:52 pm    Post subject: Reply with quote
It get's the job done and that's all I want.
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Overload
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PostPosted: Thu Sep 18, 2008 10:08 pm    Post subject: Reply with quote
_void_ wrote:
It get's the job done and that's all I want.

Gets it done very horribly.
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Travis13
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PostPosted: Fri Sep 26, 2008 11:43 am    Post subject: Reply with quote
add this question and answer PLEASE Smile.......how do u set only specific parts of the wording coloured like this?

cout << "Hello World" << endl;

but i only want "World" in red and keep everything else the same

i know its been ansered many times before but i cant find it and its a good addition to this thread

Thanks,
Travis13
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hcavolsdsadgadsg
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PostPosted: Fri Sep 26, 2008 2:25 pm    Post subject: Reply with quote
Take a look at:

GetStdHandle
SetConsoleTextAttribute
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