// print-pattern-challenge // Last updated: May 2018 /* Documentation Print the Pattern challenge from SoloLearn. Pattern 1: 1 22 333 4444 55555 and so on. Pattern 2: 1 12 123 1234 12345 and so on. Pattern 3: 1 13 135 1357 13579 and so on. Pattern 4: 0 01 010 0101 01010 and so on. Pattern 1 Reversed: ... 55555 4444 333 22 1 Pattern 2 Reversed: ... 12345 1234 123 12 1 Pattern 3 Reversed: ... 13579 1357 135 13 1 Pattern 4 Reversed: ... 01010 0101 010 01 1 */ #include void printPattern1(const int in_number_of_lines); // prints one 1's, two 2's, and so on up to in_line_numbers void printPattern2(const int in_number_of_lines); // prints 1, then 12, then 123, and so on up to in_line_numbers void printPattern3(const int in_number_of_lines); // prints 1, then 13, then 135, and so on up to in_line_numbers void printPattern4(const int in_number_of_lines); // prints 0, then 01, then 010, then 0101, up to in_line_numbers void printPattern1Reversed(const int in_number_of_lines); // Prints pattern 1 starting with the last line, ending with the 1st void printPattern2Reversed(const int in_number_of_lines); // Prints pattern 2 starting with the last line, ending with the 1st void printPattern3Reversed(const int in_number_of_lines); // Prints pattern 3 starting with the last line, ending with the 1st void printPattern4Reversed(const int in_number_of_lines); // Prints pattern 4 starting with the last line, ending with the 1st void printUsage(); // Prints help and program usage int main() { // Variables int line_numbers; // Input printUsage(); std::cout << "Please enter the number of lines: "; std::cin >> line_numbers; std::cout << '\n'; // Print patterns printPattern1(line_numbers); printPattern1Reversed(line_numbers); printPattern2(line_numbers); printPattern2Reversed(line_numbers); printPattern3(line_numbers); printPattern3Reversed(line_numbers); printPattern4(line_numbers); printPattern4Reversed(line_numbers); return 0; } void printPattern1(const int in_number_of_lines) { for (int i = 1; i <= in_number_of_lines; i++) { for (int j = 0; j < i; j++) { std::cout << i; // print i, in_line_numbers times starting with 1 } std::cout << '\n'; } std::cout << '\n'; } void printPattern2(const int in_number_of_lines) { for (int i = 1; i <= in_number_of_lines; i++) { for (int j = 1; j <= i; j++) { std::cout << j; // print 1-i, in_line_numbers times } std::cout << '\n'; } std::cout << '\n'; } void printPattern3(const int in_numbers_of_lines) { for (int i = 1; i <= in_numbers_of_lines; i += 2) { for (int j = 1; j <= i; j += 2) { std::cout << j; // prints 1-i odd, in_line_numbers times } std::cout << '\n'; } std::cout << '\n'; } void printPattern4(const int in_number_of_lines) { for (int i = 0; i < in_number_of_lines; i++) { for (int j = 0; j <= i; j++) { std::cout << j % 2; // prints alternating 0's and 1's, (i + 1) times for in_line_numbers lines // starting with (i = 0) up to (i = in_line_numbers) } std::cout << '\n'; } std::cout << '\n'; } void printPattern1Reversed(const int in_number_of_lines) { for (int i = in_number_of_lines; i > 0; i--) { for (int j = 0; j < i; j++) { std::cout << i; // prints i, i times, starting with (i = in_line_number) } std::cout << '\n'; } std::cout << '\n'; } void printPattern2Reversed(const int in_number_of_lines) { for (int i = in_number_of_lines; i > 0; i--) { for (int j = 1; j <= i; j++) { std::cout << j; // prints i-1, in_line_numbers times } std::cout << '\n'; } std::cout << '\n'; } void printPattern3Reversed(const int in_number_of_lines) { bool even = in_number_of_lines % 2 == 0; for (int i = (even ? (in_number_of_lines - 1) : in_number_of_lines); i > 0; i -= 2) { for (int j = 1; j <= i; j += 2) { std::cout << j; // prints i-1 odd, in_line_numbers times } std::cout << '\n'; } std::cout << '\n'; } void printPattern4Reversed(const int in_number_of_lines) { for (int i = in_number_of_lines; i > 0; i--) { for (int j = 0; j < i; j++) { std::cout << j % 2; // prints alternating 0's and 1's, i times for in_line_numbers lines // starting with i = in_line_numbers } std::cout << '\n'; } std::cout << '\n'; } void printUsage() { std::cout << "This program takes the number of lines as input, and prints a\n" << "pattern with that many line numbers.\n\n"; }