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#include <iostream>
#include <math.h>
using namespace std;
/* Program that graphs a quadratic equation on the standard output */
/* Equation precision - how precise the quadratic equation result should be
* - higher values are more precise, but they could not show up on the graph
* - needs to be balanced with step
* Step - size of each unit (character)
*/
const int eqPrec = 1;
const double step = 1;
const char line = '*';
const char verLine = '|';
const char horLine = '-';
const char empty = ' ';
double quadr(double x, double a, double b, double c) {
return double( round( ( (a*pow(x, 2)) + (b*x) + c) * eqPrec ) / eqPrec);
}
void printQadr(int startx, int endx, int starty, int endy, double a, double b, double c) {
double currY, currX;
for (int y = max(starty, endy); y >= min(starty, endy); y--) {
for (int x = startx; x <= endx; x++) {
currY = y * step;
currX = x * step;
if (quadr(currX, a, b, c) == currY
|| ((quadr(currX, a, b, c) < currY
|| (quadr(currX - step, a, b, c) == 0 || quadr(currX + step, a, b, c) == 0)) // Wide lines
&& (quadr(currX + step, a, b, c) > currY != quadr(currX - step, a, b, c) > currY)) // Long lines
) {
cout << line;
} else if (x == 0) {
cout << verLine;
} else if (y == 0) {
cout << horLine;
} else {
cout << empty;
}
}
cout << endl;
}
}
void printQadr(int start, int end, double a, double b, double c) {
printQadr(start, end, start, end, a, b, c);
}
int main()
{
double a = 0.2;
double b = 2;
double c = -10;
printQadr(-25, 15, 20, -15, a, b, c);
return 0;
}
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