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Declaring variables. I r newb.

Posts 1–15 of 36 · Page 1 of 3

Hallopeople. :O

I'm new to C, and C++. Reading a pretty old book as well, written...no idea when. Anyways, the book is by Sam A. Abolorous. It's called 'Learn C In Three Days'. Possible, not possible, I don't know considering I wanna take my time with programming and not burn through it. Rushing it, learning it, then when you try to apply it to something else, your like what? No, I wanna learn it properly so I can apply it wherever needed.

Anyways, back to the question. o_o So the book has a code...and it gives an example of declaring variables. I tried inputting that code, TRIED modifying it and still no luck. I get errors. I'll post the code I tried. Keep in mind I used MICROSOFT VISUAL C++.

The code from the book.

Code:

*****#include <stdafx.h>
#include <stdio.h>
main()
{
	//Declarations.
	int a;
	float b;
	//Assignment.
	a=1024;
	b=512;
	//Display output.
	printf("%d\n",a);
	printf("%f\n",b);
}

Thanks to whoever helps me out.

^_^

EDIT: I dunno how to use the code thingy...so I apologize about that. ._.
EDIT: Thanks Zeco for teaching me how to put the code.

ALRIGHT, whee. I used DevC++, and it worked. I somewhat changed the script so it pauses for a while.

Thanks Why06 for the tip. FINAL:

Code:

#include <stdio.h>
#include <conio.h>

int main()
{
	//Declarations.
	int a;
	float b;
	//Assignment.
	a=1024;
	b=512;
	//Display output.
	printf("%d\n",a);
	printf("%f\n",b);
    getch();
}

Don't really see anything wrong with that :/, except maybe putting int, infront of Main. Never really tried to see if the compiler assumes a void in that situation.

By the way, congratulations on being the most respectably new person to come to this site in Days, maybe weeks =)

And to use the code box thingy, put your code between a (code) and a (/code), except replace the regular brackets with square brackets [ ] [/ ]

Originally Posted by zeco

Ah, so I see. The code isn't the fault. I've downloaded DevC++, so I'll try inputting it in that tommorrow. It's time for me to sleep. Almost 2 AM! XD

Thank you for letting me know how to use the code, I'll try it. And thanks for the welcoming gesture as well.

Code looks well enough to me. Too lazy to compile it.

Before your main function some compilers require you put. int or void
example: void main()

also you might want to get into the habbit of putting decimals in float variables.
example: like 5.0 etc

those would probably make my compiler take it. visual studio 2008

Same i just recently started to learn c++ so i can't help u but it looks like they already have.

It helps if you post the errors because those help immensely =)

Hmmm.... well I just compiled it as a C file in my Dev-C++ compiler and it seems to have worked. All I had to do was comment out the first #include statement. Weird. I didn't know the compiler would default like that in the case of main().

Another problem is that it flashes up on the screen really fast so you can't see it. So I would include this system("pause"); on the last line so you can see what you wrote.

using namespace std; ? Don't know if it's needed with a printf statement

Originally Posted by BooYa

using namespace std; ? Don't know if it's needed with a printf statement

It isn't. =)

Originally Posted by BooYa

using namespace std; ? Don't know if it's needed with a printf statement

Nah it's useless. If you use cout << "blabla"; (C++) use using namespace std;
printf is in C, not in C++ wich use cout.

Whee, thanks to everyone that replied!

I'll try the script now with some modfications listed above in Dev C++ now. I was using MS Visual C++ earlier.

EDIT: My very first own attempt at coding an assignment from the book.

Kinda happy considering I didn't have to use the book for it.

Code:

#include <stdio.h>
#include <conio.h>
int main()
{
    //Delcarations.
    double number;
    //Assignments
    number=3.45678;
    //Output
    printf("%.0f\n", number);
    printf("%.2f\n", number);
    getch();
}

Congratulations

Adding you to my respected list

Originally Posted by Hell_Demon

Congratulations

Adding you to my respected list

Thank you very much!

And I'm honored to be on your respect list.
I'm glad, considering even though I'm new, people are friendly and really helpful. :3

Oh, and just posting how far I am along now. I've just finished learning Pointers.

Code:

#include <stdio.h>
#include <conio.h>
int main()
{
    //Declarations.
    char *a, *b;
    //Assignment.
    a="Hello Again, I'm being pointed to the character a!";
    b="Hello Again, I'm the pointer for the character b!";
    printf("%s\n%s\n",a,b);// NTS: For every character(a,b), add a string spec.
    getch();
}

Originally Posted by crushed

Thank you very much!

Code:

#include <stdio.h>
#include <conio.h>
int main()
{
    //Declarations.
    char *a, *b;
    //Assignment.
    a="Hello Again, I'm being pointed to the character a!";
    b="Hello Again, I'm the pointer for the character b!";
    printf("%s\n%s\n",a,b);// NTS: For every character(a,b), add a string spec.
    getch();
}

Pointers are quite fun =). Just be careful with them. Pointers are really cool, but if you aren't careful stuff could blow up ^^

Originally Posted by zeco

Pointers are quite fun =). Just be careful with them. Pointers are really cool, but if you aren't careful stuff could blow up ^^

That's true. LOL, It just makes everything alot easier.

After I'm done memory locations, I'm gonna try to code something that I've learnt from Chapter 1 overall. Just as a review, look at my notes to see what I've learnt and yee.

EDIT:
Uh. o_o Question for anyone that's reading this atm!

Code:

#include <stdio.h>
#include <conio.h>
int main()
{
    char *a;
    a="Hello again ";
    printf("%s\n" ,a);
    printf("%c\n" ,*a);
    printf("%d\n" ,a);
    printf("%p\n" ,a);
    printf("%d\n", *a);
    getch();
}

So I'm doing examining Memory Locations atm, and the book I'm reading gives that code as an example to do. I wrote it word for word, exactly how it should be and yet I get a different answer.
The output is supposed to be,

Code:

Hello again
H
168
00A8
72

Yet I'm getting...

Code:

Hello again
H
4206592   <-----=Incorrect
00403000  <----- =Incorrect
72

Does anyone know what I did wrong? Or can anyone explain what I'm doing wrong?
Much appreciated, thanks!.

Posts 1–15 of 36 · Page 1 of 3

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Home › Forum › Programming › C++/C Programming › Declaring variables. I r newb.

Declaring variables. I r newb.

Posts 1–15 of 36 · Page 1 of 3

Declaring variables. I r newb.

Code:

*****#include <stdafx.h>
#include <stdio.h>
main()
{
	//Declarations.
	int a;
	float b;
	//Assignment.
	a=1024;
	b=512;
	//Display output.
	printf("%d\n",a);
	printf("%f\n",b);
}

Thanks to whoever helps me out.

^_^

EDIT: I dunno how to use the code thingy...so I apologize about that. ._.
EDIT: Thanks Zeco for teaching me how to put the code.

ALRIGHT, whee. I used DevC++, and it worked. I somewhat changed the script so it pauses for a while.

Thanks Why06 for the tip. FINAL:

Code:

#include <stdio.h>
#include <conio.h>

int main()
{
	//Declarations.
	int a;
	float b;
	//Assignment.
	a=1024;
	b=512;
	//Display output.
	printf("%d\n",a);
	printf("%f\n",b);
    getch();
}

Originally Posted by zeco

Same i just recently started to learn c++ so i can't help u but it looks like they already have.

It helps if you post the errors because those help immensely =)

using namespace std; ? Don't know if it's needed with a printf statement

Originally Posted by BooYa

using namespace std; ? Don't know if it's needed with a printf statement

It isn't. =)

Originally Posted by BooYa

using namespace std; ? Don't know if it's needed with a printf statement

Nah it's useless. If you use cout << "blabla"; (C++) use using namespace std;
printf is in C, not in C++ wich use cout.

Whee, thanks to everyone that replied!

I'll try the script now with some modfications listed above in Dev C++ now. I was using MS Visual C++ earlier.

EDIT: My very first own attempt at coding an assignment from the book.

Kinda happy considering I didn't have to use the book for it.

Code:

#include <stdio.h>
#include <conio.h>
int main()
{
    //Delcarations.
    double number;
    //Assignments
    number=3.45678;
    //Output
    printf("%.0f\n", number);
    printf("%.2f\n", number);
    getch();
}

Congratulations

Adding you to my respected list

Originally Posted by Hell_Demon

Congratulations

Adding you to my respected list

Thank you very much!

Code:

#include <stdio.h>
#include <conio.h>
int main()
{
    //Declarations.
    char *a, *b;
    //Assignment.
    a="Hello Again, I'm being pointed to the character a!";
    b="Hello Again, I'm the pointer for the character b!";
    printf("%s\n%s\n",a,b);// NTS: For every character(a,b), add a string spec.
    getch();
}

Originally Posted by crushed

Thank you very much!

Code:

#include <stdio.h>
#include <conio.h>
int main()
{
    //Declarations.
    char *a, *b;
    //Assignment.
    a="Hello Again, I'm being pointed to the character a!";
    b="Hello Again, I'm the pointer for the character b!";
    printf("%s\n%s\n",a,b);// NTS: For every character(a,b), add a string spec.
    getch();
}

Pointers are quite fun =). Just be careful with them. Pointers are really cool, but if you aren't careful stuff could blow up ^^

Originally Posted by zeco

Pointers are quite fun =). Just be careful with them. Pointers are really cool, but if you aren't careful stuff could blow up ^^

That's true. LOL, It just makes everything alot easier.

After I'm done memory locations, I'm gonna try to code something that I've learnt from Chapter 1 overall. Just as a review, look at my notes to see what I've learnt and yee.

EDIT:
Uh. o_o Question for anyone that's reading this atm!

Code:

#include <stdio.h>
#include <conio.h>
int main()
{
    char *a;
    a="Hello again ";
    printf("%s\n" ,a);
    printf("%c\n" ,*a);
    printf("%d\n" ,a);
    printf("%p\n" ,a);
    printf("%d\n", *a);
    getch();
}

Code:

Hello again
H
168
00A8
72

Yet I'm getting...

Code:

Hello again
H
4206592   <-----=Incorrect
00403000  <----- =Incorrect
72

Does anyone know what I did wrong? Or can anyone explain what I'm doing wrong?
Much appreciated, thanks!.

Posts 1–15 of 36 · Page 1 of 3

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Tags for this Thread

#c++#declaring #newb #turtles.#variables