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a guest Feb 21st, 2020 73 Never
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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. float vector_product(float ax, float ay, float bx, float by)
  5. {
  6.     float val = ax * by - ay * bx;
  7.     return val;
  8. }
  9.  
  10. int main()
  11. {
  12.     float x1, y1, x2, y2, x3, y3, x4, y4;
  13.     float v1, v2, v3, v4;
  14.    
  15.     printf("Input coordinates: ");
  16.    
  17.     if (scanf("%f %f %f %f %f %f %f %f",
  18.     &x1, &y1, &x2, &y2, &x3, &y3, &x4, &y4) != 8)
  19.         return 1;
  20.  
  21.     v1 = vector_product(x4 - x3, y4 - y3, x1 - x3, y1 - y3);
  22.     v2 = vector_product(x4 - x3, y4 - y3, x2 - x3, y2 - y3);
  23.     v3 = vector_product(x2 - x1, y2 - y1, x3 - x1, y3 - y1);
  24.     v4 = vector_product(x2 - x1, y2 - y1, x4 - x1, y4 - y1);
  25.    
  26.     /*
  27.     1 - пересекаются
  28.     0 - не пересекаются
  29.     */
  30.     if (!v1 && !v2 && !v3 && !v4)
  31.         printf("0\n");
  32.     else if (((v1 * v2) <= 0) && ((v3 * v4) <= 0))
  33.         printf("1\n");
  34.     else
  35.         printf("0\n");
  36.     return 0;
  37. }
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