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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]));
}
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