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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.     return fabs(p2.x - p1.x) * fabs(p2.y - p1.y);
  17. }
  18.  
  19. double circumference_of(Point p1, Point p2) {
  20.     return 2 * (fabs(p2.x - p1.x) + fabs(p2.y - p1.y));
  21. }
  22.  
  23. int main(void) {
  24.     Point p1, p2;
  25.     printf("左上の座標を入力してください（例: 1 1）: ");
  26.     p1 = scan_point();
  27.     printf("右下の座標を入力してください（例: 4 5）: ");
  28.     p2 = scan_point();
  29.  
  30.     printf("面積\t%.2f\n", area_of(p1, p2));
  31.     printf("周囲の長さ\t%.2f\n", circumference_of(p1, p2));
  32.  
  33.     return 0;
  34. }
Success #stdin #stdout 0.01s 5284KB
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stdout
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左上の座標を入力してください（例: 1 1）: 右下の座標を入力してください（例: 4 5）: 面積	100.00
周囲の長さ	40.00
https://ideone.com/0eUCYy
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

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