#include<stdio.h>
#include<conio.h>
int main ()
{
	int i,n,a[50];
	printf ("nhap so phan tu mang n:=");
	scanf ("%d",&a[i]);
	printf(" nhap gia tri cua n=\n");
	for (i<0;i<n;i++)
	{
		printf ("a[%d]=",i);
		scanf ("%d",&a[i]);
		}
printf ("mang vua nhap la :\n");

for (i=0;i<n;i++)
printf ("%5d",&a[i]);
printf ("\nmang vua thay doi la");
for (i=0;i<n;i++)
{
if (a[i]<0)
a[i]=0;
printf ("%5d",&a[i]);
}
getch ();
}