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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. typedef struct {
  5.     double x;
  6.     double y;
  7. } Point;
  8.  
  9. Point scan_point(void)
  10. {
  11.     Point p;
  12.     scanf("%lf %lf", &p.x, &p.y);
  13.     return p;
  14. }
  15.  
  16. double area_of(Point p1, Point p2)
  17. {
  18.     double width  = fabs(p2.x - p1.x);
  19.     double height = fabs(p1.y - p2.y);
  20.     return width * height;
  21. }
  22.  
  23. double circumference_of(Point p1, Point p2)
  24. {
  25.     double width  = fabs(p2.x - p1.x);
  26.     double height = fabs(p1.y - p2.y);
  27.     return 2 * (width + height);
  28. }
  29.  
  30. int main(void)
  31. {
  32.     Point p1, p2;
  33.  
  34.     printf("左上隅と右下隅の座標を入力してください。\n");
  35.  
  36.     printf("左上隅：");
  37.     p1 = scan_point();
  38.  
  39.     printf("右下隅：");
  40.     p2 = scan_point();
  41.  
  42.     double area = area_of(p1, p2);
  43.     double cir  = circumference_of(p1, p2);
  44.  
  45.     printf("左上隅：(%.2f, %.2f)\n", p1.x, p1.y);
  46.     printf("右下隅：(%.2f, %.2f)\n", p2.x, p2.y);
  47.  
  48.     printf("面積：%.2f\n", area);
  49.     printf("周囲の長さ：%.2f\n", cir);
  50.  
  51.     return 0;
  52. }
  53.  
  54.  
Success #stdin #stdout 0s 5280KB
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stdin
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3
3
7
8
stdout
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左上隅と右下隅の座標を入力してください。
左上隅：右下隅：左上隅：(3.00, 3.00)
右下隅：(7.00, 8.00)
面積：20.00
周囲の長さ：18.00
https://ideone.com/VuL0X8
language:
C (gcc 8.3)
created:
20 days ago
visibility:
public

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