import edu.princeton.cs.introcs.StdIn; import edu.princeton.cs.introcs.StdOut; /************************************************************************* * Compilation: javac Count.java * Execution: java Count alpha < input.txt * * Create an alphabet specified on the command line, read in a * sequence of characters over that alphabet (ignoring characters * not in the alphabet), computes the frequency of occurrence of * each character, and print out the results. * * % java Count ABCDR < abra.txt * A 5 * B 2 * C 1 * D 1 * R 2 * * % java Count 0123456789 < pi.txt * 0 99959 * 1 99757 * 2 100026 * 3 100230 * 4 100230 * 5 100359 * 6 99548 * 7 99800 * 8 99985 * 9 100106 * *************************************************************************/ public class Count { public static void main(String[] args) { Alphabet alpha = new Alphabet(args[0]); int R = alpha.R(); int[] count = new int[R]; String a = StdIn.readAll(); int N = a.length(); for (int i = 0; i < N; i++) if (alpha.contains(a.charAt(i))) count[alpha.toIndex(a.charAt(i))]++; for (int c = 0; c < R; c++) StdOut.println(alpha.toChar(c) + " " + count[c]); } }