Programming challenge

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WELCOME TO THE PROGRAMMING CHALLENGE THREAD. TODAY YOU WILL CREATE A FUNCTION OR PROGRAM THAT GENERATES A CHRISTMAS TREE WITH THE USER GIVEN LENGTH.

IF YOU DON'T COMPLY, THIS BIRD WILL STAB YOU

AS ALWAYS, HERE IS THE EXAMPLE.

/*
 *  christmas.cpp
 *  Created on: Sep 14, 2016
 */

#include <iostream>
#include <string>
#include <sstream>
#include <iomanip>
#include <cstdlib>

using namespace std;


char getRandomChar(){
    int random = rand();
    if((double)random/RAND_MAX > 0.75) return '@';
    if((double)random/RAND_MAX > 0.5) return '*';
    if((double)random/RAND_MAX > 0.25) return '#';
    return '%';
}

int printtree(const int length) {
    int width = 1;
    int bottom = 0.1 * length;
    char tree = '#';
    for (int i = 0; i < length; i++) {
        string temp = "";
        if (width < 2) {
            cout << right << setw(length + 1) << tree << endl;
        } else {
            for (int j = 0; j < width - 1; j++)
                temp += getRandomChar();
            cout << right << setw(length) << temp;
            cout << tree;
            cout << left << setw(length) << temp;
            cout << endl;
        }
        width++;
    }
    if(bottom < 1){
        cout << right << setw(length + 1) << tree << endl;
    }
    for (int i = 0; i < bottom; i++) {
        string temp = "";
        for (int j = 0; j < bottom - 1; j++)
            temp += getRandomChar();
        cout << right << setw(length) << temp;
        cout << tree;
        cout << left << setw(length) << temp;
        cout << endl;
    }
}

int str2int(const string &str) {
    stringstream ss(str);
    int num;
    if ((ss >> num).fail()) {
        return 10;
    }
    return num;
}


int main(int argc, char *argv[]) {
    int length;
    if (argc > 1) {
        length = str2int(argv[1]);
    } else {
        length = 10;
    }
    srand(10983);
    printtree(length);
    return 0;
}