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+/*
+Challenge 200
+
+Task 2: Seven Segment 200
+Submitted by: Ryan J Thompson
+A seven segment display is an electronic component, usually used to display
+digits. The segments are labeled 'a' through 'g' as shown:
+
+
+Seven Segment
+
+
+The encoding of each digit can thus be represented compactly as a truth table:
+
+my @truth = qw<abcdef bc abdeg abcdg bcfg acdfg acdefg abc abcdefg abcfg>;
+For example, $truth[1] = ‘bc’. The digit 1 would have segments ‘b’ and ‘c’ enabled.
+
+Write a program that accepts any decimal number and draws that number as a
+horizontal sequence of ASCII seven segment displays, similar to the following:
+
+
+-------  -------  -------
+      |  |     |  |     |
+      |  |     |  |     |
+-------
+|        |     |  |     |
+|        |     |  |     |
+-------  -------  -------
+To qualify as a seven segment display, each segment must be drawn (or not drawn)
+according to your @truth table.
+
+The number "200" was of course chosen to celebrate our 200th week!
+*/
+
+#include <iostream>
+#include <string>
+
+#define A 1
+#define B 2
+#define C 4
+#define D 8
+#define E 16
+#define F 32
+#define G 64
+
+int truth[10] = {
+    A|B|C|D|E|F, B|C, A|B|D|E|G, A|B|C|D|G, B|C|F|G,
+    A|C|D|F|G, A|C|D|E|F|G, A|B|C, A|B|C|D|E|F|G, A|B|C|F|G
+};
+
+void draw_number(int n) {
+    std::string s = std::to_string(n);
+
+    // draw a
+    for (size_t i = 0; i < s.size(); i++) {
+        int digit = s[i] - '0';
+        if ((truth[digit] & A)==A)
+            std::cout << " ####   ";
+        else
+            std::cout << "        ";
+    }
+    std::cout << std::endl;
+    // draw f, b
+    for (int j = 0; j < 2; j++) {
+        for (size_t i = 0; i < s.size(); i++) {
+            int digit = s[i] - '0';
+            if ((truth[digit] & F)==F) std::cout << "#"; else std::cout << " ";
+            std::cout << "    ";
+            if ((truth[digit] & B)==B) std::cout << "#"; else std::cout << " ";
+            std::cout << "  ";
+        }
+        std::cout << std::endl;
+    }
+    // draw g
+    for (size_t i = 0; i < s.size(); i++) {
+        int digit = s[i] - '0';
+        if ((truth[digit] & G)==G)
+            std::cout << " ####   ";
+        else
+            std::cout << "        ";
+    }
+    std::cout << std::endl;
+    // draw e, c
+    for (int j = 0; j < 2; j++) {
+        for (size_t i = 0; i < s.size(); i++) {
+            int digit = s[i] - '0';
+            if ((truth[digit] & E)==E) std::cout << "#"; else std::cout << " ";
+            std::cout << "    ";
+            if ((truth[digit] & C)==C) std::cout << "#"; else std::cout << " ";
+            std::cout << "  ";
+        }
+        std::cout << std::endl;
+    }
+    // draw d
+    for (size_t i = 0; i < s.size(); i++) {
+        int digit = s[i] - '0';
+        if ((truth[digit] & D)==D)
+            std::cout << " ####   ";
+        else
+            std::cout << "        ";
+    }
+    std::cout << std::endl;
+}
+
+int main(int argc, char* argv[]) {
+    argv++; argc--;
+    if (argc == 0) {
+        std::cerr << "usage: ch-2 num" << std::endl;
+        exit(EXIT_FAILURE);
+    }
+
+    draw_number(atoi(argv[0]));
+}