The Big Programming Thread - Page 464

package sorter;

public class Sorter extends Word {

	public static void main(String[] args) {
		
		//declare variables
		 String words[] = {"hi", "pie", "schoolmaster", "theclassroom", "meteor", "remote", "racecar", "racecar", "nap", "pan", "God", "dog"};}}

package sorter;

public class Word{
	
	private String word;

	public void setWord(String w)
	{
		word = w;
	}
	
	public String getWord(int i)
	{
		return words[i];  //asks for me to create the local variable words.
	}
	

public class main {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		Wordlist wordlist = new Wordlist();
		wordlist.setWord("cool");
		wordlist.setWord("awesome");
		System.out.println(wordlist.getWords().toString());

	}

}
import java.util.ArrayList;


public class Wordlist {

	/**
	 * @param args
	 */
	private ArrayList<String> words;
	
	public Wordlist() {
		words = new ArrayList<>();
	}

	public void setWord(String word) {
		words.add(word);
	}
	public ArrayList<String> getWords() {
		return words;
	}
} 

//string formatting using sprintf
char buffer[100];
sprintf(buffer, "my numbers are %d, %d, and %d, and my string is %s",my_struct.nums[0], my_struct.num[1], my_struct.nums[2], my_struct.str);

package sorter;

public class Word{
	
	private String word;
        protected static String[] words;

	public void setWord(String w)
	{
		word = w;
	}
	
	public String getWord(int i)
	{
		return words[i];  //asks for me to create the local variable words.
	}
}


package sorter;

public class Sorter extends Word {
	public static void main(String[] args) {
		
		//declare variables
         words = new String[]{ "hi", "pie", "schoolmaster", "theclassroom", "meteor", "remote", "racecar", "racecar", "nap", "pan", "God", "dog" };
    }

}

On April 10 2014 08:25 Nesserev wrote:

Show nested quote +

On April 10 2014 06:10 RoyGBiv_13 wrote:

On April 10 2014 05:50 amazingxkcd wrote:
C question (not my first language, but I'm liking this language a lot so why not)

Whats the best way to convert int to chars and to concatenate chars? In my case, I would like to concatenate members of a structure into a single char array so that I can easily just spit it back out into my front end (which is just a console)?

Are you trying to format a string (string=char array)? If so, then sprintf is your friend. You could also use itoa.

Even though your way works, it's way too 'excessive', and can be risky or limiting; it's not the best way in my opinion:
Use a function that calls printf (not sprintf), with the struct as it's argument, and prints the data directly to the console:
- don't need to store the full string every time (which is way less redundant)
- no need for a buffer, no risk of buffer overflows (you don't have to worry about whether or not your C string in your structure can be too long for your buffer, and vice versa)

EDIT: I think that, if the front end wouldn't be the console, that you would have to save the string in a buffer (like you said) to use it for your front end (like a GUI, but I don't think it's a good thing to design a GUI in C).

Or am I missing something big? All I did was read Kernighan and Ritchie's 'The Ansi C Programming Language' (2nd Ed.).

EDIT2:

Show nested quote +

On April 10 2014 09:32 phar wrote:

On April 10 2014 08:25 Nesserev wrote:
EDIT: I think that, if the front end wouldn't be the console, that you would have to save the string in a buffer (like you said) to use it for your front end (like a GUI, but I don't think it's a good thing to design a GUI in C).

In the case that you do need to store the concatenated string instead of simply printing to command line, also make sure that you are using a safer method. Either do VERY careful bounds checking before your call to sprintf, or use snprintf or something similar.

Of course

struct example
{
int a;
int b;
}
example ex = {1, 2};
printf("%d%d", ex); 

struct example
{
int a;
int b;
}
example ex = {1, 2};
printf("%d%d", ex); 

printf("%d%d", ex.a, ex.b);