Plotting a function in C language?

Question

C++ / C#

Good afternoon, tell me how to plot a function graph as simply as possible using the C language?

#include <stdio.h>
#include <math.h>

int main()
{
  float x, y, z, step;
  printf("input x:\n");
  scanf("%f", &x);
  printf("Input y:\n");
  scanf("%f", &y);
  printf("input step:\n");
  scanf("%f", &step);
  printf("result:\n");
  for(int i = 0; i < 32; i++)
  {
    z = (sin(x)+cos(y))/(cos(x)-sin(y))*tan(x*y);
    printf("%.2f\t %f\n", x, z);
    x += step;		
  }
}

As a result, to get something as close as possible to a graph from Excel:

Answer 1

I think you should use gnuplot.
ndevilla.free.fr/gnuplot

Answer 2

Switch from a console application to a window application, for example, the simplest window on Qt and display the graph already in the graphics window using Qt. The graph can be drawn manually, or you can use any ready-made Qt widgets, they are.