Converting char array to an int array in c++ -

i have char array containing 3 2 4 56 1. need perform sorting function on elements of array (i have arrange them in ascending order), can't unless numeric. how can convert array int array?

actually, char array numeric:

char nums[] = {1, 5, 2, 6, 0};  std::sort(std::begin(nums), std::end(nums));  (auto = std::begin(nums); != std::end(nums); ++it)     printf("%i ", *it);