/*lich van nien*/

#include<stdio.h>

#include<conio.h>

#include<stdlib.h>

int main()

{

    char i;

    int nam,du,du1,nam1,sonam;

    nam1=1990;         

    do

    {

    printf("

nhap vao so nam can tim:");

    scanf("%d",&nam);

    sonam=abs(nam-nam1);/*abs:tra lai ham tuyet doi cho so nguyen,

    labs:tra lai ham tuyet doi cho so nguyen dai,fabs:tra lai ham tuyet doi cho so thuc*/

    du=(sonam%10);

    if(nam<nam1)

          du=10-du;/*nam truoc 1990 thi nguoc lai*/

    switch(du)/*lenh switch cung cap 1 tap cac kha nag de lua chon(nang cao cua if-else)*/

    {

       case 0: printf("nam: canh");break;/*break dung de ngat vong,switch gap break se dung lai*/     

       case 1: printf("nam: tan");break;

       case 2: printf("nam: nham");break;

       case 3: printf("nam: quy");break;

       case 4: printf("nam: giap");break;

       case 5: printf("nam: at");break;

       case 6: printf("nam: binh");break;

       case 7: printf("nam: dinh");break;

       case 8: printf("nam: mau");break;

       case 9: printf("nam: ky");break;

    }/*tu 10 can vs du =>can cua nam*/

    du1=(sonam%12);

    if(nam<nam1)

          du1=12-du1;/*nam truoc 1990 thi nguoc lai*/

    switch(du1)

    {

        case 0: printf(" ngo");break;      

        case 1: printf(" mui");break;

        case 2: printf(" than");break;

        case 3: printf(" dau");break;

        case 4: printf(" tuat");break;

        case 5: printf(" hoi");break;

        case 6: printf(" ti");break;

        case 7: printf(" suu");break;

        case 8: printf(" dan");break;

        case 9: printf(" mao");break;

        case 10: printf(" thin");break;

        case 11: printf(" ty");break;

    }/*tu 12 chi vs du1 => chi cua nam*/

    printf("

neu muon thoat nhanh ESC");

    i=getch();

    }while(i!=27);

    return 0;

}         

/*10 can:Giap At Binh Dinh Mau Ki? Canh Tan Nham Quy*/

/*12 chi:Ty Suu Dan Mao Thin Ty Ngo Mui Than Dau Tuat Hoi*/