Read, Print and Reverse Integer Arrays in C

#include <stdio.h>
#include <stdlib.h> // For exit()

#define NMAX 5
#define ELEMENTS_PER_LINE 5

// Function prototypes
void intSwap(int* x, int* y);
int getIntArray(int a[], int nmax, int sentinel);
void printIntArray(int a[], int n);
void reverseIntArray(int a[], int n);

int main(void) {
    int x[NMAX];
    int hmny;

    // Read integers into the array
    hmny = getIntArray(x, NMAX, 0);

    printf("The array was: \n");
    printIntArray(x, hmny);

    // Reverse the array
    reverseIntArray(x, hmny);

    printf("After reversing, it is:\n");
    printIntArray(x, hmny);

    return 0;
}

void intSwap(int* x, int* y) {
    // Swap the content of x and y
    int temp = *x;
    *x = *y;
    *y = temp;
}

void printIntArray(int a[], int n) {
    // Print values, ELEMENTS_PER_LINE per line
    for (size_t i = 0; i < n; ) {
        printf("\t%d ", a[i++]);

        if (i % ELEMENTS_PER_LINE == 0)
            printf("\n");
    }
    printf("\n");
}

int getIntArray(int a[], int nmax, int sentinel) {
    // Read up to nmax integers and store them in a; sentinel terminates input
    int n = 0;
    int temp;

    do {
        printf("Enter integer [%d to terminate] : ", sentinel);

        // Check for valid input
        if (scanf("%d", &temp) != 1) {
            printf("Invalid input. Exiting.\n");
            exit(EXIT_FAILURE);
        }

        if (temp == sentinel)
            break;

        if (n == nmax) {
            printf("Array is full\n");
        }
        else {
            a[n++] = temp;
        }
    } while (1);

    return n;
}

void reverseIntArray(int a[], int n) {
    // Reverse the order of the first n elements of a
    for (size_t i = 0; i < n / 2; i++) {
        intSwap(&a[i], &a[n - i - 1]);
    }
}