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I need a function that let me find n random points. These points must have the same distance from a given point. Can you help me?

void createCpoints() { int xcenter=3; int ycenter=3; int radius=3; double x[N]; double y[N]; //... }
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As @5gon12eder says, you could use polar coordinates with the initial point as virtual midpoint:

#include <math.h> //... for(int i = 0; i < n; i++) { double alpha = 2.0d*M_PI*((double) rand() / RAND_MAX); x[i] = radius*cos(alpha)+x0; y[i] = radius*sin(alpha)+y0; }

With (x0,y0) the coordinates of the original point.

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Shouldn't that be cmath instead of math.h?
@JorenHeit: all functions/constants are defined in math.h. And cmath doesn't define constants automatically.
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Just generate N angles, and calculate the (x,y) coordinates from there using

x1 = xCenter + r * cos(theta1) y1 = yCenter + r * sin(theta1)

(Note: this is not supposed to be ready-to-use C++ code. If you need help with the language, you need to be more specific.)

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