fixed.c

#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>

int main(void) {
    const size_t ARRAY_LEN = 256;

    int data[ARRAY_LEN]; memset(data, 0, ARRAY_LEN*sizeof(int));
    int input = 0, max = INT_MIN, min = INT_MAX;

    int ec = 0, separator = 0;

    // Never read more data than you can store!
    for (size_t i = 0; i < ARRAY_LEN; ++i)
    {
        /* Load next input */
        ec = scanf("%i", &input);
        if (ec == EOF) break; // no more input
        if (ec != 1) { // conversion error
            fprintf(stderr, "Conversion error on input %zi!\n", i);
            return EXIT_FAILURE;
        }

        data[i] = input;

        /* Min/Max */
        if (input < min) min = input;
        if (input > max) max = input;

        /* Check separator for EOL */
        separator = getchar();
        if (separator == EOF || ((char) separator) == '\n') break; // end of input
        if (!isspace(separator)) { // unsupported input
            fprintf(stderr, "Unsupported character after input %zi: %c\n", i, (char) separator);
            return EXIT_FAILURE;
        }
    }

    printf("Minimum: %i\nMaximum: %i\n", min, max);
    return EXIT_SUCCESS;
}