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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(int n);
  10. double area_of(Point p1, Point p2);
  11. double circumference_of(Point p1, Point p2);
  12.  
  13.  
  14. int main(void){
  15.     Point p1, p2;
  16.  
  17.     printf("左上隅と右下隅の座標を入力してください。\n");
  18.  
  19.     p1 = scan_point(1);
  20.     p2 = scan_point(2);
  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(int n){
  32.     Point p;
  33.     scanf("%lf %lf", &p.x, &p.y);
  34.     printf("座標%d(%.2f, %.2f)\n", n, 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.  
  45. double circumference_of(Point p1, Point p2){
  46.     double width = fabs(p2.x - p1.x);
  47.     double height = fabs(p2.y - p1.y);
  48.     return 2 * (width + height);
  49. }
  50.  
Success #stdin #stdout 0s 5284KB
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3 4
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(3.00, 4.00)
座標2(3.00, 4.00)
面積：0.00
周囲の長さ：0.00
https://ideone.com/7XML8e
language:
C (gcc 8.3)
created:
1 day ago
visibility:
public

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