C help

[ivanho]

I need help about this simple task.

#include<cstdio>
#include<cstdlib>
int main(void)
{
float a,b;
scanf("%f %f",&a,&b);
printf("%f",a+b);
system("pause");
return 0;
}
Input: a=2.3,b=2.4;
Output: 4.7

Compailer should print 4.7, but why is he printing 4.700000?

I use Dev-C++ 4.9.9.2

[Moschops]

I use Dev-C++ 4.9.9.2

Please don't. It's really quite bad. http://cplusplus.com/forum/articles/36896/

printf("%f",a+b);

You have directed the printf function to print out a decimal floating point number. As such, you have been given some decimal places.

If you want it to direct the number of decimal places, use the appropriate .precision value (try %4.2f, for example, and experiment with them to get a feel for what you can do). Take a look at the printf page and see all the options available to you. http://cplusplus.com/reference/clibrary/cstdio/printf/

A better option would be to use proper C++ objects.

[ivanho]

Thanks

Btw. I think Dev-C++ is good for beginners like me. It is very simple.

[Moschops]

It is very simple.

There are other IDEs which are also very simple, but have the extra bonus of not being bad.

[Computergeek01]

@ OP: I completley agree, but don't use an IDE that is old enough to start kindergarten. Try using it's more up to date spin off: http://wxdsgn.sourceforge.net/

[ivanho]

Can you give me example?

Did you mean "A better option would be to use proper C++ objects" cin and cout?

And one more question: is cin (console input) and cout (console output)?

[Moschops]

Try this. Experiment with different input values.

#include<iostream>
 
int main(void)
{
float a,b;
std::cin >> a;
std::cin >> b;
std::cout << (a+b);
std::cin.get();
return 0;
}

[ivanho]

Yes it's working, but I want to know can this code be written with "scanf and printf".

Btw. Why don't you write "using namespace std" in global area? It's easier.

[Computergeek01]

In defence of Moschops not using the std namespace, this is pretty difficult to name a specific reason. But as someone who does the same the first time it burns you and has you tearing your hair out for hours when it's 1:00 AM and no one is on the forms to help you; you'll never use it again.

[ivanho]

Thank you Computergeek1 for this link http://wxdsgn.sourceforge.net/.
Now I'am using Dev-C++ 7.3.1.
I didn't knew that is existing 7.3.1.

So thank you very much!!

[Moschops]

It's easier.

Nailing my feet to the floor is easier than using my own muscles to balance, but you don't see me doing that :)

[Computergeek01]

Lol! That is the best, and probably most accurate, analogy I've ever heard regarding the use of Bloodshed Dev-C++.

[ivanho]

I don't agree with this statement "Nailing my feet to the floor is easier than using my own muscles to balance, but you don't see me doing that :) ". LOL :=)
This Dev-C++ 7.3.1 is 100 times better than 4.9.9.2.
Thank you guys!!!

[Moschops]

It's wxDev-C++. Big difference :)

[ivanho]

Could you explain different beetwen wxDev-C++ and 7.3.1.
I don't understand

[Moschops]

To a degree I'm joking around, but they are distinctly different programmes.

Dev-C++ was mostly written and maintained by Colin Laplace and chums until early 2005. It used the MinGW port of the GNU C++ compiler, which was bundled with Dev-C++. As such, if you download Dev-C++, you're going to have a six year old C+ compiler. It's possible to update the compiler, but it's a bit of a pain, and if you put in that much effort you might as well switch away from Dev-C++ entirely.

wxDev-C++, courtesy of Guru Kathiresan and team, aimed to fill the hole left behind by the cessation of Dev-C++. It is under development, and I understand comes with a recent compiler, which makes a big difference. It has some features to make using wxWidgets easier.

[ivanho]

Thank you very much Moschops on this post.Now I know different