#include<stdio.h>
#include<conio.h>
#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]);
	}
}

bool kiemtrahoanthien(int n)
{
	int i = 1;
	int S = 0;
	while(i < n)
	{
		if(n % i == 0)
		{
			S = S + i;
		}
		i++;
	}
	if(S == n)
		return true;
	else
		return false;
}

int timsohoanthiencuoi(int a[], int n)
{
	for(int i = n - 1; i >= 0; i--)
	{
		if(kiemtrahoanthien(a[i]) == true)
		{
			return a[i];
		}
	}
	return -1;
}
int main()
{
	int n;

	int a[MAX];
	nhap(a, n);
	xuat(a, n);

	int sohoanthiencuoi = timsohoanthiencuoi(a, n);
	printf("\nSo hoan thien cuoi la %d", sohoanthiencuoi);

	getch();
	return 0;
}

Line 17: error: conio.h: No such file or directory
Line 5: error: expected ';', ',' or ')' before '&' token
In function 'xuat':
Line 25: error: 'for' loop initial declaration used outside C99 mode
t.c: At top level:
Line 31: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'kiemtrahoanthien'
In function 'timsohoanthiencuoi':
Line 51: error: 'for' loop initial declaration used outside C99 mode
Line 53: error: 'true' undeclared (first use in this function)
Line 53: error: (Each undeclared identifier is reported only once
Line 53: error: for each function it appears in.)