AMINE

package tp_string;

public class TP_String {

    static void affiche1(String str){
        for(int i=0; i<str.length(); i++)
            System.out.println(str.charAt(i));
    }

    static void affiche2(String str){
        for(int i=str.length()-1; i>=0; i--){
            System.out.println(str.charAt(i));
        }
    }

    static String extraire1(String str){
        return str.substring(2, 8);
    }

    static String extraire2(String str){
        return str.substring(9, 12);
    }

    static String extraire3(String str){
        return str.substring(2, 5);
    }

    static void construire1(String str){
        System.out.println(extraire1(str).concat("ion"));
    }

    static void construire2(String str){
        System.out.println(str.substring(5, 9).concat("n"));
    }

    static void construire3(String str){
        System.out.println(str.substring(2, 6).concat("er"));
    }

    static int rech1(String str, String recherche){
        return str.indexOf(recherche);
    }

    public static void main(String[] args) {

        String st="informatique";
        affiche1(st);
        System.out.println("");
        affiche2(st);

        System.out.println("");
        System.out.println(extraire1(st));
        System.out.println(extraire2(st));
        System.out.println(extraire3(st));

        System.out.println("");
        construire1(st);
        construire2(st);
        construire3(st);

        System.out.println("");
        System.out.println("index of ati : "+rech1(st, "ati"));
        System.out.println("index of or : "+rech1(st, "or"));
        System.out.println("index of info : "+rech1(st, "info"));
        System.out.println("index of ss : "+rech1(st, "ss"));
        System.out.println("index of q : "+rech1(st, "q"));

    }

}