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| 1 | +public class Test { |
| 2 | + |
| 3 | + public static void main(String[] args){ |
| 4 | + String s = "Samuel"+'B'; //String + char permitted, concatenation |
| 5 | + System.out.println(s.toUpperCase()); |
| 6 | + System.out.println('B'+"Samuel"); //char + String permitted, concatenation |
| 7 | + boolean vero = true; |
| 8 | + System.out.println("ZeroB"+vero); //String + boolean permitted, concatenation |
| 9 | + System.out.println(vero+"ZeroB"); //boolean + String permitted, concatenation |
| 10 | + int x = 9; |
| 11 | + System.out.println("Zero"+x); //String + int permitted, concatenation |
| 12 | + System.out.println(x+"Zero"); //int + String permitted, concatenation |
| 13 | + double c = 3.9; |
| 14 | + System.out.println("Zero"+c); //String + double permitted, concatenation |
| 15 | + System.out.println(c+"Zero"); //double + String permitted, concatenation |
| 16 | + System.out.println(x+c); //double + int and int + double permitted, double sum |
| 17 | + System.out.println('c'+x); //char + int permitted, sum of int |
| 18 | + System.out.println(x+'c'); //int + char permitted, sum of int |
| 19 | + System.out.println('c'+c); //char + double permitted, sum of double |
| 20 | + System.out.println(c+'c'); //double + char permitted, sum of double |
| 21 | + //System.out.println('c'+vero); char + boolean not legal |
| 22 | + //System.out.println(vero+'c'); boolean + char not legal |
| 23 | + //System.out.println(vero+c); boolean + double not legal |
| 24 | + //System.out.println(vero+x); boolean + int not legal |
| 25 | + //System.out.println(c+vero); int/double + bool not legal |
| 26 | + char t = 'b'; |
| 27 | + //t = t + 1; Incompatible types. Found: 'int', required: 'char' |
| 28 | + System.out.println(""+5);// 5 |
| 29 | + int[] histogram = letterHist("alpha"); |
| 30 | + for(int occurrence: histogram){ |
| 31 | + System.out.println(occurrence); |
| 32 | + } |
| 33 | + } |
| 34 | + |
| 35 | + public static int[] letterHist(String s){ |
| 36 | + String lows = s.toLowerCase(); |
| 37 | + int[] histogram = new int[26]; |
| 38 | + for(int i=0; i < lows.length(); i++){ |
| 39 | + if((int)lows.charAt(i)-97<26&&(int)lows.charAt(i)-97>=0) |
| 40 | + histogram[(int)lows.charAt(i)-97]++; |
| 41 | + } |
| 42 | + return histogram; |
| 43 | + } |
| 44 | +} |
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