#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]);
	}
}

/*
n = 6.9
phannguyen = (int)(6.9) = 6
phan le = 6.9 - 6 = 0.9

*/
void ThaySoGanNhat(float &n)
{
	int phannguyen = (int)(n);
	float phanle = n - phannguyen;
	// làm tròn
	if(phanle <= 0.5)      
	{
		n = (float)phannguyen;
	}
	else
	{
		n = (float)phannguyen + 1;
	}
}

// Giống như làm tròn
void ThayCacPhanTuTrongMangBangSoNguyenGanNoNhat(float a[], int n)
{
	for(int i = 0; i < n; i++)
	{
		ThaySoGanNhat(a[i]);
	}
}
int main()
{
	int n;
	float a[MAX];

	nhap(a, n);
	xuat(a, n);
	
	ThayCacPhanTuTrongMangBangSoNguyenGanNoNhat(a, n);
	printf("\nMang sau khi lam tron: ");
	xuat(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
t.c: At top level:
Line 38: error: expected ';', ',' or ')' before '&' token
In function 'ThayCacPhanTuTrongMangBangSoNguyenGanNoNhat':
Line 56: error: 'for' loop initial declaration used outside C99 mode