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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(p1.y - p2.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(p1.y - p2.y);
  24.     return 2 * (width + height);
  25. }
  26.  
  27. int main(void) {
  28.     Point p1, p2;
  29.     double area, circumference;   
  30.     printf("左上隅: ");
  31.     p1 = scan_point();
  32.     printf("右下隅: ");
  33.     p2 = scan_point();
  34.  
  35.     area = area_of(p1, p2);
  36.     circumference = circumference_of(p1, p2);
  37.  
  38.     printf("面積 = %.2f\n", area);
  39.     printf("周囲の長さ = %.2f\n", circumference);
  40.  
  41.     return 0;
  42. }
Success #stdin #stdout 0.01s 5276KB
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stdout
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左上隅: 右下隅: 面積 = 4.00
周囲の長さ = 8.00
https://ideone.com/ghWl09
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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