#include<stdio.h>
#include<conio.h>
#include<math.h>
#define MAX 100
void NhapMaTran(int a[][MAX], int &n)
{
	do
	{
		printf("\nNhap n: ");
		scanf("%d", &n);
		if(n < 1 || n > MAX)
		{
			printf("\nSo phan tu khong hop le. Xin kiem tra lai !");
		}
	}while(n < 1 || n > MAX);

	for(int i = 0; i < n; i++)
	{
		for(int j = 0; j < n; j++)
		{
			printf("\nNhap vao a[%d][%d] = ", i, j);
			scanf("%d", &a[i][j]);
		}
	}
}

void XuatMaTran(int a[][MAX], int n)
{
	for(int i = 0; i < n; i++)
	{
		for(int j = 0; j < n; j++)
		{
			printf("%4d",a[i][j]);
		}
		printf("\n\n");
	}
}

int KiemTraNguyenTo(int n)
{
	if(n < 2)
	{
		return 0;
	}
	else if(n > 2)
	{
		if(n % 2 == 0)
		{
			return 0;
		}
		for(int i = 3; i <= sqrt((float)n); i++)
		{
			if(n % i == 0)
			{
				return 0;
			}
		}
	}
	return 1;
}

int TimSoNguyenToDauTien(int a[][MAX], int n)
{
	for(int i = 0; i < n; i++)
	{
		for(int j = 0; j < n; j++)
		{
			if(KiemTraNguyenTo(a[i][j]) == 1)
			{
				return a[i][j];
			}
		}
	}
	return 0;
}

int TimSoNguyenToLonNhat(int a[][MAX], int n)
{
	int SoNguyenToMax = TimSoNguyenToDauTien(a, n);
	if(SoNguyenToMax == 0)
	{
		return 0;
	}
	for(int i = 0; i < n; i++)
	{
		for(int j = 0; j < n; j++)
		{
			if(KiemTraNguyenTo(a[i][j]) == 1)
			{
				SoNguyenToMax = (a[i][j] > SoNguyenToMax) ? a[i][j] : SoNguyenToMax;
			}
		}
	}
	return SoNguyenToMax;
}
int main()
{
	int a[MAX][MAX], n;
	NhapMaTran(a,n);
	XuatMaTran(a,n);

	int SoNguyenToMax = TimSoNguyenToLonNhat(a, n);
	printf("\nSo nguyen to lon nhat trong ma tran = %d", SoNguyenToMax);
	getch();
	return 0;
}

Line 17: error: conio.h: No such file or directory
Line 5: error: expected ';', ',' or ')' before '&' token
In function 'XuatMaTran':
Line 29: error: 'for' loop initial declaration used outside C99 mode
Line 31: error: 'for' loop initial declaration used outside C99 mode
In function 'KiemTraNguyenTo':
Line 51: error: 'for' loop initial declaration used outside C99 mode
In function 'TimSoNguyenToDauTien':
Line 64: error: 'for' loop initial declaration used outside C99 mode
Line 66: error: 'for' loop initial declaration used outside C99 mode
In function 'TimSoNguyenToLonNhat':
Line 84: error: 'for' loop initial declaration used outside C99 mode
Line 86: error: 'for' loop initial declaration used outside C99 mode