Why is int8_t read as a character?

Question

I wanted to put some small integers in an array and decided to use int8_t:

#include <cstdint>
#include <iostream>

int main() {
    int n = 3;
    int8_t arr[n];
    for (int i = 0; i < n; ++i) {
        std::cin >> arr[i];
    }
}

Enter 9 -20 14and n = 3.

But instead 9, -20, 14in the array I got 9, -, 2.

Why int8_tdoes it act like char?

PS int8_ttypedef'd sys/types.has follows:

# define __intN_t(N, MODE) \
  typedef int int##N##_t __attribute__ ((__mode__ (MODE)))

# ifndef __int8_t_defined
#  define __int8_t_defined
__intN_t (8, __QI__);
# endif