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C++ random number generator

/ Published in: C++
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  1. #include <iostream>
  2. #include <cstdlib>
  3. #include <ctime>
  4.  
  5. int main(int argc, char *argv[]){
  6.         if(argc != 3){
  7.                 cout << "Usage: " << endl;
  8.                 cout << "       rand [int x] [int y]" << endl;
  9.                 cout << "       [x] = highest possible value of a random number" << endl;
  10.                 cout << "       [y] = quantity of random numbers created" << endl << endl;
  11.                 exit(1);
  12.         }
  13.         long int M = atoi(argv[1]);
  14.         int quantity = atoi(argv[2]);
  15.         srand(time(NULL));
  16.         for(int count = 1; count <= quantity; ++count)
  17.                 cout << (((int)(((double)rand()/(double)(RAND_MAX+1))*M))*-1)+1 << endl;
  18.         return 0;
  19. }

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