小编ton*_*lav的帖子

我试图用C++/OpenGl绘制简单的圆圈

我的代码是:

#include <GL/glut.h>
#include <math.h>

void Draw() {
    glClear(GL_COLOR_BUFFER_BIT);
    glColor3f(1.0, 1.0, 1.0);

    glBegin(GL_QUADS);
      glColor3f (0.0, 0.0, 0.0);

      glVertex3f (0.1, 0.1, 0.0);
      glVertex3f (0.9, 0.1, 0.0);
      glVertex3f (0.9, 0.9, 0.0);
      glVertex3f (0.1, 0.9, 0.0);

    glEnd();

    glFlush();
}

void DrawCircle(float cx, float cy, float r, int num_segments)
{
    glBegin(GL_LINE_LOOP);
    for(int ii = 0; ii < num_segments; ii++)
    {
        float theta = 2.0f * 3.1415926f * float(ii) / float(num_segments);//get the current angle

        float x = r * cosf(theta);//calculate the x component
        float …

我需要java中的一个练习的帮助,我可能会坚持这个错误2小时.任何帮助都会很棒.

Exception in thread "main" java.util.InputMismatchException
    at java.util.Scanner.throwFor(Scanner.java:909)
    at java.util.Scanner.next(Scanner.java:1530)
    at java.util.Scanner.nextInt(Scanner.java:2160)
    at java.util.Scanner.nextInt(Scanner.java:2119)
    at prodavnica.Prodavnica.main(Prodavnica.java:60)
Java Result: 1


package prodavnica;

public class Proizvod {

    private String ime_proizvod;
    private static int cena;

    public Proizvod(String ime_proizvod, int cena) {
        this.ime_proizvod = ime_proizvod;
        this.cena=cena;
    }

    public String getIme_proizvod() {
        return ime_proizvod;
    }

    public void setIme_proizvod(String ime_proizvod) {
        this.ime_proizvod = ime_proizvod;
    }

    public static int getCena() {
        return cena;
    }

    public static void setCena(int cena) {
        Proizvod.cena = cena;
    }

    public void pecatiPodatoci(){ …