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    #include <math.h>
    
    double distance(double lineX1, double lineY1, double lineX2, double lineY2,
        double dotX, double dotY) {
        double a, b, c; /* ax + by + c = 0 */
        double root;
        double dist; /* µá¤á¤ëµ÷Î¥ */
    
        a = lineY1 - lineY2;
        b = lineX2 - lineX1;
        c = (-b * lineY1) + (-a * lineX1);
        root = sqrt(a*a + b*b);
    
        if (root == 0.0) {
            return -1.0; /* µá¤á¤é¤ì¤Ê¤¤¾ì¹ç¤ÏÉé¤ÎÃͤòÊÖ¤¹ */
        }
    
        dist = ((a * dotX) + (b * dotY) + c) / root;
    
        if (dist < 0.0) {
            dist = -dist;
        }
    
        return dist;
    }
    
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        a = lineY1 - lineY2;
        b = lineX2 - lineX1;
    
        if (a == 0.0 && b == 0.0) {
            return -1.0; /* µá¤á¤é¤ì¤Ê¤¤¾ì¹ç¤ÏÉé¤ÎÃͤòÊÖ¤¹ */
        }
    
        c = (-b * lineY1) + (-a * lineX1);
        root = sqrt(a*a + b*b);
    
        dist = ((a * dotX) + (b * dotY) + c) / root;
    
    

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      }
      

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          {
          if(i % c == 0)b = b + 1;
          }
          

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          {
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          }
          

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                  b = b + 1;
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                        break;
                
                    case NETNEWS:
                        fprintf(fp, "netnews");
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                        switch (i) {
                        case 0:
                            foo();
                    
                        case 1:
                            bar();
                    
                        default:
                            printf("do nothing¥n");
                        }
                    

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                        if (i == 0) {
                            foo();
                        } else {
                            bar();
                        }
                    

                    ¡¡¤³¤ì¤ò switch ¤ò»È¤Ã¤Æ½ñ¤¯¤È¡¢¼¡¤Î¤è¤¦¤Ë¤Ê¤ê¤Þ¤¹¡£

                        switch (i) {
                        case 0:
                            foo();
                            break;
                    
                        default:
                            bar();
                            break;
                        }
                    

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                    ¢£¤¨¤ëC¸À¸ì: switch ʸ

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                      U¡Öswitch ʸ¤È¤¤¤¦¤Î¤Ï?¡×

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                          switch (i) {
                          case 0:
                              foo();
                              break;
                      
                          case 1:
                              bar();
                              break;
                      
                          default:
                              printf("do nothing¥n");
                              break;
                          }
                      

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