#include <stdio.h>
#include <conio.h>

#define MAX 50

void docfile(int array[], int &n);
void xuatfile(int array[], int n);
int TimN(int array[], int n, int k);
int main() {
	int arraynumber[10];
	int n=10;
	int k;
	docfile(arraynumber, n);
	xuatfile(arraynumber, n);
	printf("\nnhap k ");
	scanf("%d", &k);
	int result = TimN(arraynumber,n, k);
  printf("%d", result);

}

void docfile(int array[], int &n)
{
	FILE* inputfile = fopen("C:\\Users\\DELL\\Documents\\input.txt", "rt");
	int i = 0;
	if (inputfile == NULL)
  {
		printf("khong doc duoc file : ");
		return;
	}
	fscanf(inputfile, "%d", &n);
	while (!feof(inputfile))
	{
		fscanf(inputfile, "%d", &array[i]);
		i++;
	}
}

void xuatfile(int array[], int n)
{
	for (int i = 0; i < n; i++)
  {
		printf("%3d",array[i]);
	}
}

 int TimN(int array[],int n,int k)
 {
	 for (int i = 1; i <= n; i++)
		 if (array[i]==k)
				 return i;

			return -1;
}