#include #include using namespace std; /* Using a #define in order to create constants is a great way to improve performance! You save space in memory and time spent retrieving values of variables because the numbers are replaced during compilation-time. This way, whats the processor had to do in execution time is now done by the compiler. Awesome, right? */ // This number here is a constant that sets the size of the diamond // This value can't be changed during execution time. // Oh yeah: and it must be odd in order to build the diamond :) #define NUMBER_OF_LINES 19 // Here is our main int main() { // If you tried to trick me into an even number of lines if(!(NUMBER_OF_LINES % 2)) { // Well, joke's on you! I won't fall for that! cout << "Number of lines must be odd!"; // End of story! return 1; } // Let me inform you the number of lines... cout << "You asked for a diamond of " << NUMBER_OF_LINES << " lines.\n" ; cout << "Let me see what I can do...\n\n"; // Values higher than 17 make a double-digit number appear on screen // Because of that, the diamond will be horizontally assymmetric :( if(NUMBER_OF_LINES > 17) cout << "Well, it's higher than 17. It won't come out that nicely, but I'll do it annyway...\n\n"; // Now I create an array of strings with each line of the diamond string finalText[NUMBER_OF_LINES]; // This value called "half" will be really useful, because the diamond is vertically symmetric const int half = 1 + (NUMBER_OF_LINES / 2); // Now I'll begin to build it' for(int line = 0; line < half; line++) { // This number will be printed in the diamond. Leave it here for now int number = 1; // First loop: insert the right amount of spaces before the first number for(int aux = line + 1; aux < half; aux++) { finalText[line] += " "; } // Second loop: insert the first half of the numbers in the line (including the middle one) for(int aux = (half - line); aux <= half; aux++) { ostringstream ss; ss << number; finalText[line] += ss.str(); // If it's not the last number int his half if(aux < half) { // Well, insert a space finalText[line] += " "; // And increase number! number++; } } // Third loop: insert the second half of the numbers in the line for(int aux = (half - line); aux < half; aux++) { ostringstream ss; ss << --number; // Now the space comes before the number finalText[line] += " " + ss.str(); } // Last loop: insert the right amount of spaces (just to make it symmetric, they are not relevant for the show) for(int aux = line + 1; aux < half; aux++) { finalText[line] += " "; } // Well, the first line is equal the last one, and so on... // So, why should I do it again? Just copy it! finalText[NUMBER_OF_LINES - 1 - line] = finalText[line]; } // It's time to print the diamond for(int line = 0; line < NUMBER_OF_LINES; line++) { cout << finalText[line] << endl; } // REALLY BEAUTIFUL cout << endl << "Beautiful, isn't it?"; cout << endl << "Try changing the value of NUMBER_OF_LINES inside the code, in line 16!"; cout << endl << "And, you if liked it, spread the love <3"; }

A diamond of numbers!