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Added big_random function => within a certain range (Issue #19) #52

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Added big_random function => within a certain range (Issue #19) #52

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20 changes: 20 additions & 0 deletions include/functions/random.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -45,4 +45,24 @@ BigInt big_random(size_t num_digits = 0) {
}


/*
big_random (low, high)
-----------------------
Returns a random BigInt such that low <= BigInt <= high
*/

BigInt big_random(size_t low = 0, size_t high) {
std::random_device rand_generator; // true random number generator

num_digits = 1 + rand_generator() % high.value.size();

BigInt big_rand;
big_rand.value = ""; // clear value to append digits

while (big_rand.value > low && big_rand.value < high)
big_rand.value += std::to_string(rand_generator());

return big_rand;
}

#endif // BIG_INT_RANDOM_FUNCTIONS_HPP