C++ in Array

Program 25

#include 

#include
#include 
#include 
int main(int argc, char* argv[])
{
    try 

       {
        if (argc > 1) 

         {
            int value = lexical_cast(argv[1]);
            std::string msg;
            msg = "the passed value is: "+ lexical_cast(value);
            std::cout << msg << std::endl;
        }
    }
    catch (const char* msg) 

       {
        std::cerr << "Exception: " << msg << std::endl;
        return exit_failure;
    }
}

Program 26

#include 

#include
#include 
int main()
{
    std::ostrstream buffer;

    buffer << "Pi: " << 3.1415 << std::ends;

    std::cout << buffer.str() << std::endl;

    buffer.freeze(false);

    buffer.seekp(-1,std::ios::end);

    buffer << " or also: " << std::scientific << 3.1415<< std::ends;
           
    str() freezes the char* stream

    std::cout << buffer.str() << std::endl;

    buffer.freeze(false);
}

C++ Destructor Programs

#include

#include

using namespace std;

class marks

{

public:

int maths;

int science;

marks()

{

cout<<”Inside constructor”<

cout<<”C++ object created”<

}

~marks()

{

cout<<” Inside Destructor”<

cout<<”C++ Object destructed”<

}

};

int main()

{

marks m1;

marks m2;

return 0;

}

Output

Inside constructor

C++ object created

Inside constructor

C++ object created

Inside Destructor

C++ Object destructed

Inside Destructor

C++ Object destructed

Size of Data Types

#include

#include

using namespace std;

int main()

{

cout<<” Size of int:”<

cout<<”Size of long int:”<

cout<<”Size of float:”<

cout<<”Size of double:”<

cout<<”Size of char:”<

return 0;

}

Output

Size of int : 4

Size of long int : 4

Size of float : 4

Size of double : 8

Size of char : 1