The goal of this programming assignment is to implement a program in C++  that displays a table of values for simple formulas of the form f(x) = A*sin(B*x) + C*sin(D*x) for different values of A,B,C,D. After the table of values is printed your program should then plot a curve on the screen. You must use cout/cin (not printf/scanf) and C++ style parameter passing in this program. For example, if the user inputs A, B, C, D values to ask you to plot 5*sin(1.5*x) + 3*sin(2.5*x) from 0, 3, your program should output a table something like this:

  x  | y
-----------
0.00 | 0.00
0.20 | 2.92
0.40 | 5.35
0.60 | 6.91
0.80 | 7.39
1.00 | 6.78
1.20 | 5.29
1.40 | 3.26
1.60 | 1.11
1.80 | -0.80
2.00 | -2.17
2.20 | -2.91
2.40 | -3.05
2.60 | -2.79
2.80 | -2.39

Then, it should output a plot something like this:

0.00 |                     *
0.20 |                             *
0.40 |                                   *
0.60 |                                       *
0.80 |                                        *
1.00 |                                      *
1.20 |                                   *
1.40 |                              *
1.60 |                        *
1.80 |                    *
2.00 |                *
2.20 |              *
2.40 |              *
2.60 |               *
2.80 |                *
     +----------------------------------------+
    -8.00                                   8.00

Notice that this plot shows the x values on the left and the horizontal position of the * is given by the corresponding f(x) value. To implement this, you will need to use iteration. The outer loop will control how many lines get printed. An inner loop (or a function call) will print the number of spaces needed in the current line.

Your program should prompt the user for values of A,B,C,D and the range of x values to plot. Because different parameters will result in different range of f(x) values to plot, you will have to perform a conversion of some sort so the display fits within a fixed width window.
3. Design:
You have several basic steps, each of which should be done in a separate function:
# Get user input  done
# Calculate X, Y values and store them  done
# Print a table of X, Y values      done
# Plot the X, Y values        I'm stuck

here's the code for what i've done so far

#include<stdio.h>
#include<math.h>
#include<iostream>
#include<iomanip>
using namespace std;

const int NumSteps=15;


void Fillx(const float Stepsize, const float xmin, float XVals[])
{
   for(int i=0;i<NumSteps;i++)
      XVals[i]=xmin + Stepsize*i;
}
void Filly(float XVals[], float YVals[])
{
   float A,B,C,D;

     cout << "Enter the value for A: ";
     cin >> A;
     cout << "Enter the value for B: ";
     cin >> B;
     cout << "Enter the value for C: ";
     cin >> C;
     cout << "Enter the value for D: ";
     cin >> D;
     for (int i=0; i < NumSteps; i++)
     YVals[i]=A*sin(B*XVals[i]) + C*sin(D*XVals[i]);
     cout << endl;
}
int main()
{
  float xmin,xmax;
  float Range, Stepsize;
  float XVals[NumSteps];
  float YVals[NumSteps];
  cout << "Graph plotter Program by"      << endl;
  cout << "###################" << endl;
  cout << "##Name                  ##" << endl;
  cout << "### ID NO  ###" << endl;
  cout << "###################" << endl;
  cout << endl;
  cout << "Enter Min value of x: ";
  cin >> xmin;
  cout << "Enter Max value of x: ";
  cin >> xmax;
  Range=xmax-xmin;
  Stepsize=Range/NumSteps;
  cout <<endl;
  Fillx(Stepsize, xmin, XVals);
  Filly(XVals, YVals);
  cout <<"  X "<<" | "<<" Y " << endl;
  cout <<"------------"<<endl;
  for (int i=0; i < NumSteps; i++)
  printf("%4.2f | %4.2f\n",XVals[i],YVals[i] );
  return 0;

}


I really need help on how to include a function to plot the graph before midnight today any help would be highly appreciated

// SHORT WAY TO PRINT GRAPH
//y = A*sin(B*x) + C*sin(D*x)
//Since you have a range for min and max Y(f(min X), f(maxX))
// Get the min and max values stored somewhere
// 1) PRINT the Value of X
//2) calculate f(x) for x Value, Print (f(min X)+ f(x)) SPACES
//3) PRINT asterix at (y,x) point ( just printing * after the spaces should suffice)
//4) print end of line and start over for each X
//5) Print the Y axes and points outputting f(MIn X) and each ends as you have in your graph

Ps. Sorry, my compiler not working well tonight as I need to reload for C++ . will check in to help if you still need help

@Kobojunkie

//2) calculate f(x) for x Value, Print (f(min X)+ f(x)) SPACES
  //3) PRINT asterix at (y,x) point ( just printing * after the spaces should suffice)
  //4) print end of line and start over for each X
  //5) Print the Y axes and points outputting f(MIn X) and each ends as you have in your graph

Thanks, i really appreciate it but i still can't get it right. I could print out the arrays for x value and the corresponding f(x)=y for it, i also got the range(xmax-xmin),
please can you explain a little bit more from 2). Thanks so much

Note that I make the following assumptions here

a) Based on user's entry, you calculate the Max Y value, and you have that done
b) Min Y is simply negative of Max Y, you also mark that as done
c) You already have your 15 X values from Min(x) to Max(x)
d) You start printing from min Y point on graph i.e -8 in the case of your post
e) Zero point for most case will be ((min(Y) - (min(Y))
eg, say minY is 2 then, 2-2 = 0,
in case minY = -8, then (- - (- = 0


To Output the Graph, Use a FOR LOOP to start from the min(x) value in your array, within your loop do the following
Step one: Print the X Value and follow it with the '|' character as shown in the graph
Step two: Using iteration to calculate ((min(Y) - (min(Y)) + Y), print a space character for each move
Step Three: Print an * right after that.
Repeat Steps one through Three for each X

Try that and see,  still have not gotten around to writting it

@Kobojunkie  I finally figured out how to do it after spending the whole night battling with it. It worked just the way you explained it THANKS   I'm really grateful for your assistance

@kobojunkie

Thanks, Cos I also learn something from this.

How u doing?