c++ - Why am I getting numbers outside the range I passed? -


i new c++ , not understand why numbers outside range. i
commented thought initial range

#include <vector> #include <iostream> #include <random> #include <time.h>  using namespace std; using std::vector;  int main() {   vector<int> deck;  default_random_engine eng(time(0));

i thought here specify range of random numbers instead numbers outside range

 uniform_int_distribution<int> dis(0, 51);   int pos1;  int pos2;  int num1;  int num2;  int i;  int n;  int m;   (i = 1; < 53; i++)  {      deck.push_back(i);   }   pos1 = dis(eng);  pos2 = dis(eng);   num1 = deck.at(pos1);  num2 = deck.at(pos2);    (n = 0; n < 100; n++)  {      pos1 = dis(eng);      pos2 = dis(eng);       cout << pos1 << "\n" << pos2;   }      }

it looks problem in last line cout << pos1 << "\n" << pos2; (here forgot add << "\n"). if program prints 4 numbers (e.g. 22, 23, 24, 25) see following text:

22 2324 25

so number 2324 outside range, concatenation of 2 numbers.


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