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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. Point scan_point(void);
  9. double area_of(Point p1, Point p2);
  10. double circumference_of(Point p1, Point p2);
  11.  
  12. int main(void) {
  13.     Point p1, p2;
  14.     double area, circumference;
  15.     printf("左上隅と右下隅の座標を入力してください。\n");
  16.     printf("座標１（x y）：");
  17.     p1 = scan_point();
  18.  
  19.     printf("右下の座標を入力してください（x y）：");
  20.     p2 = scan_point();
  21.  
  22.     area = area_of(p1, p2);
  23.     circumference = circumference_of(p1, p2);
  24.  
  25.     printf("面積：%.2f\n", area);
  26.     printf("周囲の長さ：%.2f\n", circumference);
  27.  
  28.     return 0;
  29. }
  30.  
  31. Point scan_point(void) {
  32.     Point p;
  33.     scanf("%lf %lf", &p.x, &p.y);
  34.     return p;
  35. }
  36.  
  37. double area_of(Point p1, Point p2) {
  38.     double width = fabs(p2.x - p1.x);
  39.     double height = fabs(p2.y - p1.y);
  40.     return width * height;
  41. }
  42.  
  43. double circumference_of(Point p1, Point p2) {
  44.     double width = fabs(p2.x - p1.x);
  45.     double height = fabs(p2.y - p1.y);
  46.     return 2 * (width + height);
  47. }
Success #stdin #stdout 0.01s 5264KB
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Standard input is empty
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（x y）：右下の座標を入力してください（x y）：面積：0.00
周囲の長さ：0.00
https://ideone.com/Y5zfQu
language:
C (gcc 8.3)
created:
19 days ago
visibility:
public

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