[SOLVED] Learning programming

MTK358 · 07-04-2011, 01:22 PM

Quote:

Originally Posted by theNbomr

conio.h sounds like something out of the DOS world. For Linux you will need to use the termios API and/or the ncurses library instead. Time to start learning how to link with external libraries. For details, consult your local man pages.

--- rod.

I don't think that the OP needs anything like ncurses for this project.

It's just that when his friend rewrote the code, he appearantly used conio.h to clear the screen at the start and wait for a key press at the end (probably so that the terminal doesn't close when he launched it from a Windows GUI). Both of those functions are unnecessary and annoying for a Linux command-line app.

Nabeel · 07-04-2011, 10:23 PM

Quote:

Originally Posted by MTK358

So what you need to do is this:

Code:

char n[100];
char p[100];

scanf("%s, %s", n, p);

The [n] syntax when creating a variable actually puts n amount of variables, one after another, on the stack.

The book I am referring had stated %c as a <format string> to print character in printf() while you have used %s. could you please explain this?

and now The program shows only one error while executing

Quote:

m.c: In function ‘main’:
m.c:24: warning: format ‘%d’ expects type ‘int’, but argument 2 has type ‘int *’

Could some one please explain this error ?

dugan · 07-05-2011, 12:12 AM

Quote:

Originally Posted by Nabeel

The book I am referring had stated %c as a <format string> to print character in printf() while you have used %s. could you please explain this?

Your code isn't using %c to print a character. It's using %c to print an array of characters. That's wrong. Use use %s, as we said.

theNbomr · 07-05-2011, 01:45 AM

Quote:

Originally Posted by Nabeel

The program shows only one error while executing

The error you show is not a run-time error message; its a compile-time message (and only a warning, at that). You can also get errors from the linker. C code usually doesn't emit error messages; it just crashes.

--- rod.

Nabeel · 07-05-2011, 02:38 AM

Well the program did got compiled but i got this error while executing the output file

Code:

a.out: 1: Syntax error: "(" unexpected

easuter · 07-05-2011, 03:40 AM

Nabeel, if you want to start out with Python I'd recommend this book:

http://www.greenteapress.com/thinkpy...hinkpython.pdf

It's a great intro both for Python and how to think like a programmer

markush · 07-05-2011, 03:59 AM

Quote:

Originally Posted by easuter

Nabeel, if you want to start out with Python
...

from what I can tell he is learning C

I found this tutorial, maybe it helps: http://profesores.fi-b.unam.mx/cintia/ctutor.pdf

Markus

MTK358 · 07-05-2011, 06:58 AM

Quote:

Originally Posted by Nabeel

The book I am referring had stated %c as a <format string> to print character in printf() while you have used %s. could you please explain this?

scanf reads, it doesn't write. Also, it doesn't make any sense to read a character (instead of a string) after printing "What is your name? :".

Nabeel · 07-06-2011, 01:10 PM

Ok I wrote another simple program, which is as follow

Code:

/* Calculating simple Interest*/
/* Author Nbl */
/* Dated 6/7/2011 */
# include <stdio.h>
void main()
{
 int p,n;
 float r,si;
  printf("enter values of p,n,r");
  scanf("%d%d%f,&p,&n,&r");
  si = p*n*r/100;
printf("%f" , si);

}

It did compiled But with the following warning

Code:

m2.c: In function ‘main’:
m2.c:10: warning: too few arguments for format

and upon executing the output file I again got this error.

Code:

a.out: 1: Syntax error: "(" unexpected

markush · 07-06-2011, 01:24 PM

Quote:

Originally Posted by Nabeel

Code:

  scanf("%d%d%f",&p,&n,&r);

at least the quotations in your code seem to be wrong.

Note that there is a manpage for any C function, try

Code:

man scanf

in a terminal.

Markus

MTK358 · 07-06-2011, 01:37 PM

When looking at the manpage of a function, It's best to use "man 3 function-name" instead of "man function-name". By default, if there is a command with the same name, its manpage will be shown, but "3" tells it to look at C functions only.

markush · 07-06-2011, 01:39 PM

@MTK358, thanks for the explanation. You're right. Fortunately the "man scanf" command leads to the manpage in section 3.

Markus

Nabeel · 07-06-2011, 02:37 PM

well I wrote another program that didn't used the scanf() function but I still got the same error when executing it. (it too compiled with no problem)

Here is the program

Code:

#include<stdio.h>


void main()
{

printf("saud rehman\n");
printf("08b-008-te\n");
printf("computer programming principle");

}

markush · 07-06-2011, 02:40 PM

This program works for me. Which errormessage do you get? Which compiler are you using?

Markus

Nabeel · 07-06-2011, 02:56 PM

i Got the following error message

Code:

a.out: 1: Syntax error: word unexpected (expecting ")")

As for the compiler, I am using gcc.