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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.     printf("x座標を入力: ");
  12.     scanf("%lf", &p.x);
  13.     printf("y座標を入力: ");
  14.     scanf("%lf", &p.y);
  15.     return p;
  16. }
  17.  
  18. double area_of(Point p1, Point p2) {
  19.     double width = fabs(p1.x - p2.x);
  20.     double height = fabs(p1.y - p2.y);
  21.     return width * height;
  22. }
  23.  
  24. double circumference_of(Point p1, Point p2) {
  25.     double width = fabs(p1.x - p2.x);
  26.     double height = fabs(p1.y - p2.y);
  27.     return 2.0 * (width + height);
  28. }
  29.  
  30. int main(void) {
  31.     printf("左上隅の座標(p1)を入力:\n");
  32.     Point p1 = scan_point();
  33.  
  34.     printf("\n右下隅の座標(p2)を入力:\n");
  35.     Point p2 = scan_point();
  36.  
  37.     double area = area_of(p1, p2);
  38.     double circumference = circumference_of(p1, p2);
  39.  
  40.     printf("\n面積: %.2f\n", area);
  41.     printf("周囲の長さ: %.2f\n", circumference);
  42.  
  43.     return 0;
  44. }
  45.  
Success #stdin #stdout 0.01s 5316KB
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stdin
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Standard input is empty
stdout
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左上隅の座標(p1)を入力:
x座標を入力: y座標を入力: 
右下隅の座標(p2)を入力:
x座標を入力: y座標を入力: 
面積: 0.00
周囲の長さ: 0.00
https://ideone.com/DkPPSE
language:
C (gcc 8.3)
created:
12 days ago
visibility:
public

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