OpenGL line widths

#include <GL/gl.h>
#include <GL/glut.h>
#include <stdio.h>

int main(int argc, char* argv[])
{
    GLfloat sizes[2] = {0.0f, 0.0f};
    GLfloat step = 0.0f;

    glutInit(&argc, argv);
    glutCreateWindow("single triangle");

    glGetFloatv(GL_LINE_WIDTH_RANGE,sizes);
    glGetFloatv(GL_LINE_WIDTH_GRANULARITY,&step);

    printf("line width range: %f - %f\n", sizes[0], sizes[1]);
    printf("line granularity: %f\n", step);

    return 0;
}