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- package p_normal;
- import java.util.*;
- public class bokstavtilltal {
- public static void main(String[] args) {
- Scanner sc = new Scanner(System.in);
- // behandlar indatan
- System.out.println("Skriv in den bokstav du vill ska bli ett nummer: ");
- String str = sc.next();
- // skriver utdata samtidigt som den anropar StringToNumber
- System.out.println("bokstaven: " + str + " blir: " + stringTillNummer(str));
- }
- // räknar genom en Hashmap ut vad för nummer varje bokstav har
- public static int stringTillNummer(String str) {
- char[] ls = "abcdefghijklmopqrstuvwqyz".toCharArray();
- Map<Character, Integer> m = new HashMap<Character, Integer>();
- int j = 1;
- for(char c: ls) {
- m.put(c, j++);
- }
- int i = 0;
- int mul = 1;
- for(char c: new StringBuffer(str).reverse().toString().toCharArray()) {
- i += m.get(c) * mul;
- mul *= ls.length;
- }
- return i;
- }
- }
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