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  1. #include <iostream>
  2. #include <vector>
  3. #include <math.h>
  4. #include <stdlib.h>
  5.  
  6. using namespace std;
  7.  
  8. int main()
  9. {
  10.   int i;
  11.   int n;
  12.   double sum_squares = 0;
  13.   double euclid_dist = 0;
  14.  
  15.   // initialize random number generator with random seed 123
  16.  
  17.   srand48(123);
  18.  
  19.   // two vectors of elements of type double
  20.  
  21.   vector<double> u;
  22.   vector<double> v;
  23.  
  24.   // read vector size n from input
  25.  
  26.   cin >> n;
  27.  
  28.   // resize the vectors to accommodate n elements
  29.  
  30.   u.resize(n);
  31.   v.resize(n);
  32.  
  33.   // generate both vectors random, each variable from 
  34.   // uniform distribution over interval [0,1) 
  35.  
  36.   for (i=0; i<n; i++)
  37.     {
  38.       u[i] = drand48();
  39.       v[i] = drand48();
  40.     }
  41.  
  42.   // compute the sum of square differences between the 
  43.   // vector elements
  44.  
  45.   for (i=0; i<n; i++)
  46.     {
  47.       double diff = u[i] - v[i];
  48.       sum_squares += (diff*diff);
  49.     }
  50.  
  51.   // Euclidean distance is the square root of the sum of 
  52.   // square differences
  53.  
  54.   euclid_dist = sqrt(sum_squares);
  55.  
  56.   // print out the sum of squares and the distance
  57.  
  58.   cout << "sum of squares:     " << sum_squares << endl;
  59.   cout << "Euclidean distance: " << euclid_dist << endl;
  60.  
  61.   // return from main with 0
  62.  
  63.   return 0;
  64. }
  65.  
Success #stdin #stdout 0.01s 2820KB
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stdin
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stdout
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sum of squares:     183.494
Euclidean distance: 13.546
https://ideone.com/2uEzt
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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