Problem with cout, please help, it's urgent

[Animesh Mandal]

main(){
cout<<"Hello World";
}

This output will be : Hello World

But can we output "Hi! Hello World" without modifying the code in main()?

Can anyone help me out of this?

[ilikepython]

main(){
cout<<"Hello World";
}

This output will be : Hello World

But can we output "Hi! Hello World" without modifying the code in main()?

Can anyone help me out of this?

No, whatever is in main that is what is going to be executed. If you want to output: "Hi! Hello World", just put "cout << "Hi! Hello World";. cout prints out anything after "<<". Is that what you need?

[Animesh Mandal]

No, whatever is in main that is what is going to be executed. If you want to output: "Hi! Hello World", just put "cout << "Hi! Hello World";. cout prints out anything after "<<". Is that what you need?

Can't we write anything without disturbing the main() function ? Something outside main().

[ilikepython]

Can't we write anything without disturbing the main() function ? Something outside main().

Well you can create your own function that you call from main, but everything that happens in a program starts from main. That's where the program starts.

#include <iostream>
 
using namespace std;
 
void myfunction(){
    cout << "Hi! Hello World" << endl;
}
int main(){
    myfunction();
    return 0;
}
OUTPUT:
"Hi! Hello World"
 

[Animesh Mandal]

Well you can create your own function that you call from main, but everything that happens in a program starts from main. That's where the program starts.

#include <iostream>
 
using namespace std;
 
void myfunction(){
    cout << "Hi! Hello World" << endl;
}
int main(){
    myfunction();
    return 0;
}
OUTPUT:
"Hi! Hello World"
 

But, again we are writing lines inside main() ! Can't we use any preprocessor directives like #define or #pragma ?

[ilikepython]

But, again we are writing lines inside main() ! Can't we use any preprocessor directives like #define or #pragma ?

I don't think so. The preprocessor doesn't know C or C++. It just alters the source file. Check out this page:
http://www.cplusplus.com/doc/tutorial/preprocessor.html

[weaknessforcats]

If you need to chnage the display without changing main(), you could:
1) use a command line argument
2) code main() to display a variable
- have the user enter the contents from the keyboard
- or read a disc file with the correct message

[jesusdiehard]

main(){
cout<<"Hello World";
}

This output will be : Hello World

But can we output "Hi! Hello World" without modifying the code in main()?

Can anyone help me out of this?

i think its very easy, just try this,

class abc{
public:
abc() { cout <<"Hi !"; }
};
abc a;

main(){
cout<<"Hello World";
}

[weaknessforcats]

This code:

class abc{
public:
abc() { cout <<"Hi !"; }
};
abc a;

main(){
cout<<"Hello World";
}

still requires that the file containing main() be changed in order ot change the message.

The only way to not change the code in order to change the message is to not have the message in the code in the first place.

[JosAH]

This code:


still requires that the file containing main() be changed in order ot change the message.

The only way to not change the code in order to change the message is to not have the message in the code in the first place.

But the requirements where not to change the main() method. Jesusdiehard's
solution didn't change that function. btw this is exactly the question as from
Stroustrup's book in one of his little exercises.

kind regards,

Jos

[r035198x]

But the requirements where not to change the main() method. Jesusdiehard's
solution didn't change that function. btw this is exactly the question as from
Stroustrup's book in one of his little exercises.

kind regards,

Jos

I thought I recognized that from somewhere.
Also, I think, the question has been asked here before.