C++ random number generator

#include <iostream>
#include <cstdlib>
#include <ctime>

int main(int argc, char *argv[]){
if(argc != 3){
cout << "Usage: " << endl;
cout << "       rand [int x] [int y]" << endl;
cout << "       [x] = highest possible value of a random number" << endl;
cout << "       [y] = quantity of random numbers created" << endl << endl;
exit(1);
}
long int M = atoi(argv[1]);
int quantity = atoi(argv[2]);
srand(time(NULL));
for(int count = 1; count <= quantity; ++count)
cout << (((int)(((double)rand()/(double)(RAND_MAX+1))*M))*-1)+1 << endl;
return 0;
}

source

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