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Alphablend · 11-26-2009, 06:50 AM

Some of these tasks I will post don’t have title so I will just name them Task <number>.

Task:
You enter two variables, string and a char. Make a program which will check if the entered character is in the entered string. If yes, make a new string, in which the entered char, present in the entered string, will be put in brackets.

Sample input:
mathematics
m

Sample output:
(m)athe(m)atics
Java code:

Code:

import cs1.*;

public class example{

    public static void main (String[]args){

        String s1=Keyboard.readString();

        char c1=Keyboard.readChar();

        if (s1.indexOf(c1)!=-1){

            String s2="";

            for (int i=0;i<s1.length();i++)

            if (s1.charAt(i)==c1)

            s2+="("+c1+")";

            else

            s2+=s1.charAt(i);

            System.out.println(s2);

        }

    }

}

***drdebcol*** · 11-26-2009, 07:02 AM

Very good done. String.charAt function exists in C++, but in pascal you need to treat string as an array of characters.
Good solution !

codecaine · 11-26-2009, 07:09 AM

reply or if you use delphi or free pascal compiler they have the function Pos() to retrieve the index within a string.

***drdebcol*** · 11-26-2009, 07:17 AM

Yeah certainly pos() function is for that, i have solution in Pascal using Pos function :

Code:

program string_and_char;

uses wincrt;

var

s:string;

k:char;

i:integer;

begin

 readln(s);

 readln(k);

 if pos(k,s)>0 then

  begin

   for i:=1 to length(s) do

     if s[i]=k then

       write('(',k,')')

     else

       write(s[i]);

  end

 else

  writeln('Char is not in the string !');

end.

This code prints string directly on to screen if that char is inside of that string.
And also about nature of pos (position of string) which returns integer value which represents position of sub string in string. If it returns 0 that means that char "k" is not inside of string "s", and if it is bigger than zero than it is okay, and that is this line :

Code:

if pos(k,s)>0 then

More about strings and functions with strings you have here :
http://www.pro9ramming.com/learnpascal/strings.html

codecaine · (This post was last modified: 11-26-2009 08:07 AM by codecaine.)

Nice work! Wink

python style

Code:

tempStr = raw_input("Enter a string: ");

tempChar = raw_input("Enter a charcter: ");

parsedStr = tempStr.replace(tempChar[0],'(' + tempChar[0] + ')');

print(parsedStr);

I forgot that delphi and fpc had a AnsiReplaceStr(). You can do it the exact same way as I did it in python

My java version

Code:

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        String tempStr, charStr, finalStr;

        char mychar;

         //initialize scanner class to recieve input

        Scanner scan = new Scanner(System.in);

        //get string input

        System.out.println("Enter in a string");

        tempStr = scan.nextLine();

        //get character input

        System.out.println("Enter a character");

        charStr = scan.nextLine();

        //return first character of string input

        mychar = charStr.charAt(0);

        //replace occurances of character with brackets around it

        finalStr = tempStr.replaceAll(String.valueOf(mychar), '(' + String.valueOf(mychar) + ')');

        //print result

        System.out.println("Result: " + finalStr);

    }

}

Showing of the power of unix console Smile

this will work on mac or linux Smile

Code:

echo Enter a string

read mystring

echo Enter a character

read mychar

echo $mystring | sed "s/$mychar/($mychar)/g"

I could of done ${mychar:0:1} to just to return the first character of the string, but I didn't want it to look to complex

Alphablend · 11-26-2009, 08:45 AM

Wow Python is total ownage.
It seems so simple and yet so powerful. Wink

Though I still don't understand this code, I tried it.
I'm using Python 2.5.

codecaine · 11-26-2009, 08:54 AM

(11-26-2009 08:45 AM)Alphablend Wrote: Wow Python is total ownage.
It seems so simple and yet so powerful.
Though I still don't understand this code, I tried it.
I'm using Python 2.5.

What part you don't understand and i'll explain.

Alphablend · 11-26-2009, 08:57 AM

its about this line:

Code:

parsedStr = tempStr.replace(tempChar[0],'(' + tempChar[0] + ')')

i see that this is the main part of the program.
what this operation 'replace' does actually? and why do we have [0] in both of these places? Smile

hope this is not a nooby question, i'm a beginner in python and i just tried your code.

codecaine · 11-26-2009, 08:57 AM

tempChar[0] part is because I only want the first character from the string, and not the whole string the user input if they entered more then 1 characters.

Alphablend · (This post was last modified: 11-26-2009 09:05 AM by Alphablend.)

(11-26-2009 08:57 AM)codecaine Wrote: tempChar[0] part is because I only want the first character from the string, and not the whole string the user input if they entered more then 1 characters.

oh i get it. its simple. Idea

i just had to turn on my brain for a sec.
ooh... i'm liking this language. Big Grin

thanks.