#include<stdio.h>
#include<conio.h>
#include<math.h>
#define MAX 100

void nhap (float 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("%f", &a[i]);
	}
}

void xuat(float a[], int n)
{
	for(int i = 0; i < n; i++)
	{
		printf("%8.3f", a[i]);
	}
}
float timduongdautien(float a[], int n)
{
    for (int i = 0; i < n; i++)
    {
         if (a[i] > 0)
         {
             return a[i];
         }
    }
    return -1;
}
float timgiatriduongnhonhat(float a[], int n)
{
	float duongnhonhat = timduongdautien(a, n);
	for(int i = 0; i < n; i++)
	{
		if(a[i] > 0 && a[i] < duongnhonhat)
		{
			duongnhonhat = a[i];
		}
	}
	return duongnhonhat;
}

void LietKeViTriBgGiaTriDuongMin(float a[], int n)
{
	float DuongMin = timgiatriduongnhonhat(a, n);
	for(int i = 0; i < n; i++)
	{
		if(a[i] == DuongMin)
		{
			printf("%4d", i);
		}
	}
}
int main()
{
	int n;
	float a[MAX];

	nhap(a, n);
	xuat(a, n);

	int vitriduongdau = timduongdautien(a, n);
	if(vitriduongdau == -1)
	{
		printf("\nMang khong co so duong");
	}
	else
	{
	printf("\nVi tri ma gia tri tai do bang gia tri duong nho nhat: ");
	LietKeViTriBgGiaTriDuongMin(a, n);
	}
	getch();
	return 0;
}

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 'timduongdautien':
Line 33: error: 'for' loop initial declaration used outside C99 mode
In function 'timgiatriduongnhonhat':
Line 45: error: 'for' loop initial declaration used outside C99 mode
In function 'LietKeViTriBgGiaTriDuongMin':
Line 58: error: 'for' loop initial declaration used outside C99 mode