#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define MAXSIZE 100

void populate ( int A[], int n )
{
    int i;
    srand((unsigned int)time(NULL));
    for (i = 0; i < n; ++i) A[i] = 1 + rand() % 9;
}

void prnarray ( int A[], int n )
{
    int i;
    for (i=0; i<n; ++i)
        printf("%4d%c", A[i], (i < n-1) ? ',' : '\n');
}

void prefix ( int A[], int n )
{
    int i;

    for (i=1; i<n; ++i) A[i] += A[i-1];
}

void unprefix ( int A[], int n )
{
    for (int i = 0, t = 0; i<n; ++i) {
        int a;

        a = A[i];
        A[i] -= t;
        t = a;
    }
}

int main ()
{
    int A[MAXSIZE], n;

    printf("n = "); scanf("%d", &n);
    populate(A,n);
    prnarray(A,n);
    prefix(A,n);
    prnarray(A,n);
    unprefix(A,n);
    prnarray(A,n);
    exit(0);
}