CSc 220 Programming Assignments

You are to write a C program to read in several numerical parameters describing a quadratic function and plot the function. The plot will be a simple text-oriented graph, turned sideways from the usual: the x axis will be vertical and y horizontal.

Input

The input consists of the following numbers:

• The coefficients A, B, and C of the equation

  y = Ax² + Bx + C

  These are floating point quantities which should be read as doubles.

• The range of x values to plot, two floating point quantities giving the low and high x bound: startx and endx.
• The range of y values to plot, also a floating point lower and upper bound.
• The integer number of x values to plot, nx. This is also the number of printed lines which will appear on the main part of the graph. The first and last x values printed (the top and bottom lines of your plot) will be the first and last values in the x range, and nx - 2 evenly-spaced values will be given between them. (The x range will be divided into nx - 1 equal steps.)
• The number nxsep of x steps separating numbers printed on the x axis. Also an integer.

Note that the input numbers must appear in the correct order, but their arrangement on lines is indifferent. The C scanf function will read them this way.

You may assume that the input is correct.

Output

The output is a text-based graph. Its (horizontal) y axis takes up 70 characters of space, and its (vertical) x axis uses nx lines. Place a 70-character line above and below the graph, with a statement of the y value range to which it corresponds At the right (70 characters past the left edge), place a vertical line made of | characters. On the first line, and at intervals of nxsep lines, replace the | with + and give the x value for that line. Give the value to the right of the line.

Inside the area defined by the axes, place one * on each line for which its y value is in in range. Place it correctly according to the y value.

Notes

Each line of the output will represent one x value. The first one being startx, and the others being spaced at increments of (endx - startx) / (nx - 1). Loop through these values. For each one, compute the corresponding y value. If it is within the range starty to endy, compute its distance beyond starty, and scale to the distance of 70 characters. Print the *, with the spaces to locate it correctly.

When reading in double quantities, use the scanf conversion %lf. If you use simple %f, something interesting may happen.

Examples

For the input:

For

When your program works, submit over the web here.

CSc 220 Assignment 1

CSc 220 Assignment 3