Account for length to an arrow

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C++

Visual-Studio

This code prints an arrow using '*'. Could somebody help me on how I could also account for the length of the arrow from tail to point? Using C++ in Visual Studio 2013

#include <iostream>
#include <sstream>


void draw_arrow(int width, int tail, char draw){
//print head
for(int i = 1; i <= width; i+=2){
//print spaces
for(int j=0; j<(width-i)/2; j++)
std::cout << " ";
//print chars
for(int j=0; j<i; j++)
std::cout << draw;

std::cout<<"\n";
}
//print tail
for(int i = 0; i < width/2; i++){
for(int j=0; j<(width-tail)/2; j++)
std::cout << " ";
for (int j=0; j<tail; j++)
std::cout << draw;
std::cout << std::endl;
}


}

int main()
{
int width_of_arrow = 0;
int width_of_tail = -1;
char drawing_char = '\0';
std::string input;
std::cout << "Input Width of Arrow: ";
std::getline(std::cin, input);
std::stringstream(input) >> width_of_arrow;

std::cout << "Input Width of Tail: ";
std::getline(std::cin, input);
std::stringstream(input) >> width_of_tail;
if (width_of_tail == -1) width_of_tail = 1;

std::cout << "Input Drawing Character: ";
std::getline(std::cin, input);
drawing_char=input[0];
if (drawing_char == '\0') drawing_char = '*';

draw_arrow(width_of_arrow, width_of_tail, drawing_char);
return 0;
}