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  1. #include <stdio.h>
  2.  
  3. typedef struct{
  4.     double x;
  5.     double y;
  6. }Point;
  7.  
  8. Point scan_point(void){
  9.     Point p;
  10.  
  11.     scanf("%lf %lf", &p.x, &p.y);
  12.  
  13.     return p;
  14. }
  15.  
  16. double area_of(Point p1, Point p2){
  17.     double S;
  18.     S=(p1.x-p2.x)*(p1.y-p2.y);
  19.     if(S<0){
  20.         S=S*(-1);
  21.     }
  22.     return S;
  23. }
  24.  
  25. double circumference_of(Point p1, Point p2){
  26.     double L, x, y;
  27.     x=p1.x-p2.x;
  28.     y=p1.y-p2.y;
  29.     if(x<0){
  30.         x=x*(-1);
  31.     }
  32.     if(y<0){
  33.         y=y*(-1);
  34.     }
  35.     L=x*2+y*2;
  36.     return L;
  37. }
  38.  
  39.  
  40. int main (void){
  41.     Point p1, p2;
  42.  
  43.     printf("左上隅の座標を入力してください。\n");
  44.     p1=scan_point();
  45.  
  46.     printf("右上隅の座標を入力してください。\n");
  47.     p2=scan_point();
  48.  
  49.     printf("座標1(%.2f, %.2f)\n", p1.x, p1.y);
  50.     printf("座標2(%.2f, %.2f)\n", p2.x, p2.y);
  51.  
  52.     printf("面積：%.2f\n", area_of(p1, p2));
  53.     printf("周囲の長さ：%.2f\n", circumference_of(p1, p2));
  54.  
  55.     return 0;
  56. }
Success #stdin #stdout 0s 5320KB
comments (?)
stdin 
1 2 3 4
stdout 
左上隅の座標を入力してください。
右上隅の座標を入力してください。
座標1(1.00, 2.00)
座標2(3.00, 4.00)
面積：4.00
周囲の長さ：8.00
https://ideone.com/nRvgmp
1016
language:
C99 (gcc 8.3)
created:
19 days ago
visibility:
public

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