//int
//printf(const char *, ...);
#include <stdio.h>

//void *
//malloc(size_t size);
//
//void
//free(void *ptr);
#include <stdlib.h>

void
init_array(int n, int *x)
{
    for (int i=0; i<n; ++i) {
        x[i] = i+1;
    }
}

void
print_array(int n, const int *x)
{
    for (int i=0; i<n; ++i) {
        printf("%5d ", x[i]);
    }
    printf("\n");
}

int
sum_array(int n, const int *x)
{
    int sum = 0;
    for (int i=0; i<5; ++i) {
        sum += x[i];
    }
}

int
main()
{
    unsigned int n = 5;
    int *x = malloc(n*sizeof(int));

    // init x
    init_array(n, x);

    // print x
    print_array(n, x);

    // sum elements of x
    int sum = sum_array(n, x);

    printf("sum = %d\n", sum);

    free(x);
}