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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.     Point p;
  11.     scanf("%lf %lf", &p.x, &p.y);
  12.     return p;
  13. }
  14.  
  15. double area_of(Point p1, Point p2) {
  16.     double width = fabs(p2.x - p1.x);
  17.     double height = fabs(p2.y - p1.y);
  18.     return width * height;
  19. }
  20.  
  21. double circumference_of(Point p1, Point p2) {
  22.     double width = fabs(p2.x - p1.x);
  23.     double height = fabs(p2.y - p1.y);
  24.     return (width + height) * 2.0;
  25. }
  26.  
  27. int main(void) {
  28.     Point p1, p2;
  29.  
  30.     printf("左上隅と右下隅の座標を入力してください。\n");
  31.  
  32.     printf("座標1");
  33.     p1 = scan_point();
  34.  
  35.     printf("座標2");
  36.     p2 = scan_point();
  37.  
  38.     double area = area_of(p1, p2);
  39.     double circ = circumference_of(p1, p2);
  40.  
  41.     printf("座標1(%.2f, %.2f)\n", p1.x, p1.y);
  42.     printf("座標2(%.2f, %.2f)\n", p2.x, p2.y);
  43.     printf("面積：%.2f\n", area);
  44.     printf("周囲の長さ：%.2f\n", circ);
  45.  
  46.     return 0;
  47. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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0.00 0.00
1.00 1.00
stdout
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左上隅と右下隅の座標を入力してください。
座標1座標2座標1(0.00, 0.00)
座標2(1.00, 1.00)
面積：1.00
周囲の長さ：4.00
https://ideone.com/lvHv1B
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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