C, pasted on Oct 6:
 ```1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 ``` ```#include #include #include #define MAX 100 void nhap (int a[], int &n) { do { printf("\nNhap so phan tu: "); scanf("%d", &n); if(n <= 0 || n > MAX) { printf("\nSo phan tu khong hop le. Xin kiem tra lai !"); } }while(n <= 0 || n > MAX); for(int i = 0; i < n; i++) { printf("\nNhap a[%d]: ", i); scanf("%d", &a[i]); } } void xuat(int a[], int n) { for(int i = 0; i < n; i++) { printf("%4d", a[i]); } } double TinhKgCachTBGiuaCacGiaTriTrongMang(int a[], int n) { int Tong = 0; int y = 0; for(int i = 0; i < n; i++) { for(int j = i + 1; j < n; j++) { Tong += abs(a[i] - a[i + 1]); y++; } } return pow(Tong, 1.0/y); } int main() { int n; int a[MAX]; int x; nhap(a, n); xuat(a, n); float KgCach = TinhKgCachTBGiuaCacGiaTriTrongMang(a, n); printf("\nKhoang cach TB giua cac gia tri trong mang = %.3f", KgCach); getch(); return 0; } ```

Output:
 ```1 2 3 4 5 6 7 ``` ```Line 17: error: conio.h: No such file or directory Line 6: error: expected ';', ',' or ')' before '&' token In function 'xuat': Line 26: error: 'for' loop initial declaration used outside C99 mode In function 'TinhKgCachTBGiuaCacGiaTriTrongMang': Line 36: error: 'for' loop initial declaration used outside C99 mode Line 38: error: 'for' loop initial declaration used outside C99 mode ```

nếu chỉ có 1 phàn tử thì sao ạ

#include<iostream>
#include<cmath>
using namespace std;
#define MAX 100

void nhap (int a[], int &n )
{
do
{
cout<<"Nhap so phan tu: ";
cin>> n;
if(n <= 0 || n > MAX )
{
cout<<"\nSo phan tu khong hop le. Xin kiem tra lai !";
}
}while(n <= 0 || n > MAX);
for(int i = 0; i < n; i++)
{
cout<<"\nNhap a["<<i<<"] = " ;
cin>>a[i];
}
}

float KetQua(int a[], int n){
float sum=0,dem=0;
for(int i=0;i<n-1;++i){
sum += abs(a[i]-a[i+1]);
}
return sum/(n-1);
}

int main()
{
int n;
int
a[MAX];
nhap(a, n);
cout<<"Ket qua la : "<<KetQua(a,n);
return 0;
}