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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. double area_of(Point p1, Point p2);
  11. double circumference_of(Point p1, Point p2);
  12.  
  13. int main(void) {
  14.     Point p1, p2;
  15.  
  16.     printf("左上隅と右下隅の座標を入力してください。\n");
  17.     printf("座標1 ");
  18.     p1 = scan_point();
  19.     printf("座標2 ");
  20.     p2 = scan_point();
  21.  
  22.     double area = area_of(p1, p2);
  23.     double circum = circumference_of(p1, p2);
  24.  
  25.     printf("面積：%.2f\n", area);
  26.     printf("周囲の長さ：%.2f\n", circum);
  27.  
  28.     return 0;
  29. }
  30.  
  31. Point scan_point(void) {
  32.     Point p;
  33.     printf("(x, y) = ( ) ");
  34.     scanf("%lf %lf", &p.x, &p.y);
  35.     return p;
  36. }
  37.  
  38. double area_of(Point p1, Point p2) {
  39.     double width = fabs(p2.x - p1.x);
  40.     double height = fabs(p2.y - p1.y);
  41.     return width * height;
  42. }
  43.  
  44. double circumference_of(Point p1, Point p2) {
  45.     double width = fabs(p2.x - p1.x);
  46.     double height = fabs(p2.y - p1.y);
  47.     return 2 * (width + height);
  48. }
  49.  
Success #stdin #stdout 0s 5316KB
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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) = ( ) 座標2 (x, y) = ( ) 面積：0.00
周囲の長さ：0.00
https://ideone.com/5uureQ
language:
C (gcc 8.3)
created:
14 days ago
visibility:
public

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