Reverse(String s): String -take a String as an argument and return the String re

Question

Reverse(String s): String -take a String as an argument and return the String reversed. Eg. "Hello" would be returned as "olleH". binaryToDecimal(String s): int -take a String as an argument and return the decimal equivalent as an integer. If any of the characters are neither zero nor one return -1. Eg. "1000" would return 8. "10001" would return 17. "111111" would return 63. "111112" would return -1. "100001.1" would return -1. stats(String s, char c): void -take a String us an argument and print the number of words, the number of characters and the number of times char c appears in the String.

Explanation / Answer

MethodsTest.java

public class MethodsTest {

  
   public static void main(String[] args) {
       String s = "hello";
       MethodsTest m = new MethodsTest();
       System.out.println(m.reverse(s));
       System.out.println(m.binaryToDecimal("10001"));
       System.out.println(m.binaryToDecimal("10001.1"));
       s = "hello how are you";
       m.stats(s, 'l');
   }
   public String reverse(String s){
       String reverseString ="";
       for(int i=s.length()-1; i>=0; i--){
           reverseString = reverseString+s.charAt(i);
       }
       return reverseString;
   }
   public int binaryToDecimal(String s){
       int decimal = 0;
       for(int i=s.length()-1,j=0; i>=0; i--,j++){
           if(s.charAt(i) == '1' || s.charAt(i) == '0'){
           if(s.charAt(i) == '1'){
           decimal=decimal+(int)Math.pow(2, j);
           }
           }
           else{
               return -1;
           }
       }  
       return decimal;
   }
   public void stats(String s, char c){
       int numberOfWords = 0;
       int numberOfChars = s.length();
       int charCount = 0;
       for(int i=0; i<s.length(); i++){
           if(s.charAt(i)==c){
               charCount++;
           }
       }
       numberOfChars = s.split("\s+").length;
       System.out.println("Number of Words: "+numberOfWords);
       System.out.println("Number of characters: "+numberOfChars);
       System.out.println("Number of times character "+c+" appears: "+charCount);
      
   }
  
}

OUtput:

olleh
17
-1
Number of Words: 4
Number of characters: 17
Number of times character l appears: 2

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