problem with Cout statement

[pllaybuoy]

I am also learning C++ at the college, but they never used "using namespace std".
The program that I learnt was very simple and something like this :

Code: (C) [Select]

#include<iostream.h>
void main()
{
cout<<2 + 5 <<endl;
cout<<5 + 8 <<endl;
}
You can try this also.

I bet your code can 'not' work . You didn't use either "using namespace std" or "std::cout/endl" . There is no way that code should work .

[rasenove]

@ Sudeep, Your code is Wrong because,

1. main() always returns a value 0 to the caller (OS) at the end if everything goes okay. which is why we use "int", because main() returns an integer value (0) to the caller. but void functions dont return any value.

2. This is c++ where you dont have to include the header files (that comes with the compiler) extensions. my minGW compiler complains about that.(most compilers will too)
yor using the "c" standard in c++.

3. you didnt include the std, not including it makes cout and endl undefined so the compiler shouts at that too.

4. You didnt put any return statement at the end of main(). the
return 0;
is for informing the caller that everything went fine, if not it returns another integer value. this is a very bad mistake, because the compilers dont give an error msg for not stating return 0;


Seems like your college is teaching the old standards of c++.

[sudeep]

@ Sudeep, Your code is Wrong because,

1. main() always returns a value 0 to the caller (OS) at the end if everything goes okay. which is why we use "int", because main() returns an integer value (0) to the caller. but void functions dont return any value.

2. This is c++ where you dont have to include the header files (that comes with the compiler) extensions. my minGW compiler complains about that.(most compilers will too)
yor using the "c" standard in c++.

3. you didnt include the std, not including it makes cout and endl undefined so the compiler shouts at that too.

4. You didnt put any return statement at the end of main(). the
return 0;
is for informing the caller that everything went fine, if not it returns another integer value. this is a very bad mistake, because the compilers dont give an error msg for not stating return 0;


Seems like your college is teaching the old standards of c++.

Using the "void" before function main means that the function main() does not return any value so there is no need of the return() inside the main.
I use Turbo C++.

[pllaybuoy]

@ Sudeep, Your code is Wrong because,

1. main() always returns a value 0 to the caller (OS) at the end if everything goes okay. which is why we use "int", because main() returns an integer value (0) to the caller. but void functions dont return any value.

2. This is c++ where you dont have to include the header files (that comes with the compiler) extensions. my minGW compiler complains about that.(most compilers will too)
yor using the "c" standard in c++.

3. you didnt include the std, not including it makes cout and endl undefined so the compiler shouts at that too.

4. You didnt put any return statement at the end of main(). the
return 0;
is for informing the caller that everything went fine, if not it returns another integer value. this is a very bad mistake, because the compilers dont give an error msg for not stating return 0;


Seems like your college is teaching the old standards of c++.

Since the main function is defined with return type void , returning a value here does not make sense.(but yes a bad habit I believe ).And you don't include header files extensions ? Did you mean the iostream ? I've been including it because it would give the  following error when iostream is not inlcuded
"cout undefined , cin undefined " - because ostream and istream classes are defined in iostream.h/iostream.But I used devcpp(which is outdated) back then and made a habit to include it . I shall check this out with visual c++ if that is really the case and see if not including iostream works .

[rasenove]

Using the "void" before function main means that the function main() does not return any value so there is no need of the return() inside the main.
I use Turbo C++.

Most compilers wont let you get away with it if you dont state main() as an int function.

@ pllaybuoy;  Yes i ment <iostream> when i said " header files that are provided by the compilers".  modern compilers wont recognise  <iostream.h> .(e.g. my minGW didnt)

[pllaybuoy]

Most compilers wont let you get away with it if you dont state main() as an int function.

@ pllaybuoy;  Yes i ment <iostream> when i said " header files that are provided by the compilers".  modern compilers wont recognise  <iostream.h> .(e.g. my minGW didnt)

Hi , I am using visual studio IDE nd have mingw and turbo compilers on my hand
#include <iostream.h> gave error but #include <iostream> worked perfectly fine .

[rasenove]

Hi , I am using visual studio IDE nd have mingw and turbo compilers on my hand
#include <iostream.h> gave error but #include <iostream> worked perfectly fine .

Thats my point. what do you want to say now?

[pllaybuoy]

Thats my point. what do you want to say now?

Well , I am not really getting your point here ,bro . The .h extension was reserved for those header files which were imported from C without any change while the C++ header files were decided to have no extension . So you can either use <iostream.h>(old C++ books have iostream.h in their text) or you can do <iostream> .
Either way you have to include this header file(in most cases) so it is safe to assume that without this you will get compiling error .

[rasenove]

Consider this code snippet,

Code: (c++) [Select]

#include <iostream>            // header file that comes with compiler.
#include <iostream>           // old c++ style (out dated), modern c style
#include "header.h"            // header file that the coder wrote.

blah..........
blah............
blah...............


Im saying you should drop your old programming habits and start using the (modern) standards, hope youll get me now.

[pllaybuoy]

Consider this code snippet,

Code: (c++) [Select]

#include <iostream>            // header file that comes with compiler.
#include <iostream>           // old c++ style (out dated), modern c style
#include "header.h"            // header file that the coder wrote.

blah..........
blah............
blah...............


Im saying you should drop your old programming habits and start using the (modern) standards, hope youll get me now.

Alright , dude