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  1.     #include <stdio.h>
  2.     #include <stdlib.h>
  3.     #include <math.h>
  4.  
  5.     #define MAX_PTS 100
  6.     #define MAX_POLYS 100
  7.     #define END_INPUT 0
  8.  
  9.     struct Point {
  10.         double x, y;
  11.     };
  12.  
  13.     double getDistance(struct Point a, struct Point b) {
  14.         double distance;
  15.         distance = sqrt((a.x - b.x) * (a.x - b.x) + (a.y-b.y) *(a.y-b.y));
  16.         return distance;
  17.     }
  18.  
  19.     int main(int argc, char *argv[]) {
  20.         int npoints, poly_id;
  21.         struct Point a, b;
  22.  
  23.         if(scanf("%d %d", &npoints, &poly_id)) {
  24.             int iteration = 0;
  25.             scanf("%lf %lf", &a.x, &a.y);
  26.             struct Point initialPoint = a;
  27.             double parameter = 0;       
  28.             for (iteration = 1; iteration < npoints; ++iteration) {
  29.                 scanf("%lf %lf", &b.x, &b.y);
  30.                 parameter += getDistance(a, b);
  31.                 a = b; // for next iteration
  32.             }
  33.             parameter += getDistance(a, initialPoint);
  34.  
  35.             printf("Polygon is %d\n", poly_id);
  36.             printf("perimeter = %2.2lf m\n", parameter); 
  37.         } else { printf("\nUnable to read input.\n");
  38.           exit(EXIT_FAILURE);
  39.         }
  40.  
  41.         return 0;
  42.     }
Success #stdin #stdout 0s 2056KB
comments ()
stdin
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3 12867 1.0 2.0 1.0 5.0 4.0 5.0
stdout
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Polygon is 12867
perimeter = 10.24 m
https://ideone.com/g8jAww
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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