public class FunctionManager {
    private static final int Y_START = -10;
    private static final int Y_STOP = 10;
    private static final int Y_STEP = 1;

    private static final int X_START = -10;
    private static final int X_STOP = 10;
    private static final int X_STEP = 1;

    static int aSquare; static int bSquare; static int cSquare;
    static int aLinear; static int bLinear;

    public FunctionManager(int aSquare, int bSquare, int cSquare, int aLinear, int bLinear) {
        this.aSquare = aSquare;
        this.bSquare = bSquare;
        this.cSquare = cSquare;
        this.aLinear = aLinear;
        this.bLinear = bLinear;
        printFunctions();
    }

    public static void main(String[] args) {
        new FunctionManager(1,-5,6,2,-6);
    }

    private static void printFunctions() {
        for (int y = Y_START;y<=Y_STOP;y+=Y_STEP){
            buildRow(y);
            System.out.println();
        }
        printXAxis();
    }

    private static void printXAxis() {
        System.out.print("     ");
        for (int x = X_START; x<= X_STOP; x+= X_STEP){
            System.out.print(String.format("%-5s",x));
        }
    }

    private static void buildRow(int y) {
        printYAxis(y);
        for (int x = X_START; x<= X_STOP; x+= X_STEP){
            buildPoint(x,y);
        }
    }

    private static void buildPoint(int x, int y) {
        boolean isSquareHit = testSquareFunctionInPoint(x,y);
        boolean isLinearHit = testLinearFunctionInPoint(x,y);

        if (isSquareHit && isLinearHit){
            System.out.print("  ~  ");
        } else if (isSquareHit && (!isLinearHit)){
            System.out.print("  *  ");
        }
        else if ((!isSquareHit) && isLinearHit){
            System.out.print("  -  ");
        } else {
            System.out.print("     ");
        }
    }

    private static boolean testLinearFunctionInPoint(int x, int y) {
        return g(aLinear, bLinear, x) == y;
    }



    private static boolean testSquareFunctionInPoint(int x, int y) {
        return f(aSquare,bSquare,cSquare,x) == y;
    }

    private static double f(double a, double b, double c, int x){
        return a * x * x + b * x + c;
    }

    private static double g(double a, double b, int x){
        return a * x + b;
    }

    private static void printYAxis(int y) {
        System.out.print(String.format("%-5s",y));
    }


}