7 replies to this topic

[A v i]

In a national - level competition I am supposed to compete in C++ .

 

I know little bit o' JAVA but unluckily there is no scope for that in the event.  

 

I will have to learn the basic syntax, creating user-defined functions, creating arrays and all other things need to work with maths as the competition asks logical / mathematical questions much like Project Euler ones. 

 

Can anyone recommend a small tutorial particularly covering my interested area ? and more importantly what are the software installations needed ? IDE ? Compiler ?   

 

 

 

 

[nnnik]

Hi 
I know 2 C++ compilers.

• One is Microsoft Visual C++ 
• the other one is the GCC compiler.

Microsoft Visual C++ comes in different Version with a complex IDE.
Dunno about the GCC C++ compiler.
 
Basic Syntax:
Ill simply tell you the greatest difference between AHK syntax and C++ syntax.
First:
AHK:

a:=20
if (a=20)
   msgbox

C++:

#include <iostream>
using namespace std;

int main ()
{
int a=20;
if (a==20)
    cout << "a is 20"; 
}

• Variables need to have a specific preset type, you define that type before you start using the var.
• You assign expressions in AHK with := in C++ with = only !
• You compare in AHK with = or == in C++ only with == !
• You have to write these ****ing semicolons after every line (except it is an control statement like the if here) !
• C++ is case sensitive !.
• Includes are similar to AHK.
• Ifs have some similarities with AHK ifs.
• Functions also have a specific return type.
• Evey pieces of executed code are inside functions (this time the main function)

AHK:

function(a,b,c)
{
return a*b*c
}

C++:

int function(int a,int b,int c)
{
return a*b*c;
}

Still the type problem.

 

Now Pointers&Arrays:

a:=[]
Loop,15
  a.insert(A_Index)
;or
a:=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15]

C++

int a[15] = {1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};

accessing:

AHK&C++:

a[x] ;

You can find more information here:

http://www.cplusplus...gram_structure/

[A v i]

Hi 
I know 2 C++ compilers.

• One is Microsoft Visual C++ 
• the other one is the GCC compiler.

Microsoft Visual C++ comes in different Version with a complex IDE.
Dunno about the GCC C++ compiler.

What about Code::Blocks and Dev C++ ? 

Thanks for your time spent on typing those info, very helpful . I had a downloaded copy of cplusplus.com 's tutorial and so I will use that for further study.

[nnnik]

Compared to GCC ánd VC++ they are rather small.

[A v i]

yes, small and so I downloaded one of them (dev) in the meanwhile. 

Will try them later.

[A v i]

I stressed on dev c++ and code::blocks because the competition is supposed to use them. 

 

@nnnik

Cool .  Ran my first code , yours code. 

[vasili111]

You can also check qt 5. It has very nice IDE.

[A v i]

@vasili111 Thanks... don't know about the IDE but it has a nice site.

 

@All

How to extract number from string and vice versa in C++ ?

static_cast<type> doesn't work.