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KtraNgto.CPP

Thursday, September 2, 2010 8:18:36 AM

#include <iostream.h>
#include <conio.h>
void main()
{
	clrscr();
	int i,n;
	cout<<"\n\nNhap so can kiem tra: ";
	cin>>n;
	if (n==1 || n==2)
		cout<<"La so nguyen to";
	else
		for (i=2;i<n;i++)
			if (n%i==0)
			{
				cout<<"Khong phai so nguyen to";
				break;
			}
	if (n == i)
		cout<<"La so nguyen to";
	getch();
}

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DocSo.CPP

Thursday, September 2, 2010 8:16:39 AM

#include <stdafx.h>
#include <stdio.h>
void main()
{
	int n, end=1;

	//--Nhap so nguyen duong co 4 chu so--
	do
	{
		printf("Nhap 1 so nguyen bat ki co 4 chu so: ");
		scanf("%d",&n);
		if (n<1000 || n>9999)
		{
			printf("Ban nhap sai roi. Vui long nhap lai.");
			end=0;
		}
	} while(end=0);

	int x = 10000, y = 1000;
	for (int i=1; i<=4; i++)
	{
		//--Tach so--
		int kiTuSo;
		kiTuSo = (n%x) / y;
		x = x/10;
		y = y/10;

		//--Doc ki tu duoc tach ra--
		switch(kiTuSo)
		{
		case 0:
			{
				printf("Khong ");
				break;
			}
		case 1:
			{
				printf("Mot ");
				break;
			}
		case 2:
			{
				printf("Hai ");
				break;
			}
		case 3:
			{
				printf("Ba ");
				break;
			}
		case 4:
			{
				printf("Bon ");
				break;
			}
		case 5:
			{
				printf("Nam ");
				break;
			}
		case 6:
			{
				printf("Sau ");
				break;
			}
		case 7:
			{
				printf("Bay ");
				break;
			}
		case 8:
			{
				printf("Tam ");
				break;
			}
		case 9:
			{
				printf("Chin ");
				break;
			}
		}
	}
}

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