// This program solves the challenge by Arun located // here: // https://www.sololearn.com/Discuss/798398/?ref=app // Use only C++,,, // if an user gives the value of n=4 then the above // output come . // * // * // * * // * * // * * // * // * // I assume it was a school assignment so didn't // post it, but wanted to solve it for the fun of it. #include // ******************** print ******************** // // This function figures out and prints the // pattern. // // Arguments // Nothing. // // Returns // Nothing. void print(int n) { // Calculate the number of lines need for the // output and allocate the output strings and // two loop indexes. int m = n*2-1; std::string o[39]; int i; int j; // For each output line, fill it in. for (i = 0; i < m; i++) // For each possible star column, add the // star or blank as needed. Note: to reverse // the pattern, index 0 to n-1. for (j = n-1; j >= 0; j--) // If both indexes are odd or even, star // might be needed. if ((i+j)%2 == 0) // The star pattern gets widest at the // center line. Each line either side of // the center gets less stars. If the // current line number is within the // range of the center line plus or // minus the current column, output the // star. if (i >= (m/2+1)-(n-j+1) && i <= (m/2+1)+(n-j-1)) o[i] += "* "; // Otherwise, no star for this column so // output space. else o[i] += " "; // Otherwise, one index is odd and the other // even so space not star. else o[i] += " "; // Output all of the lines. for (i = 0; i < m; i++) std::cout << o[i].c_str() << std::endl; } // print // ******************** main ******************** // // This is the main entry point of the program // to output a star pattern. Read the maximum // number of stars in the large end of the // pattern and if it is reasonable, print the // pattern, otherwise, complain. // // Arguments // Nothing. // // Returns // A zero. int main() { int n; std::cout << "Enter number of lines: " << std::flush; std::cin >> n; std::cout << std::endl; if (n >= 1 && n <= 20) print(n); else std::cout << "Enter 1 to 20" << std::endl; return 0; } // main

stars ch