#include<stdio.h>
#include<conio.h>
#include<stdlib.h>
void nhap(int *x)
{
    printf("Nhap N: ");
    scanf("%d",x);
    while(*x<=0 || *x>=100)
    {
        printf("Nhap lai N: ");
        scanf("%d",x);
    }
    return;
}
void nhapmang(int *x, int y)
{
    int i;
    for(i=0; i<y; i++)
    {
        printf("Nhap mang[%d] = ",i);
        scanf("%d",x+i);
    }
    return;
}
void inmang(int *x, int y)
{
    int i;
    for(i=0; i<y; i++)
    {
        printf("mang[%d] = %d\n",i,*(x+i));
    }
    return;
}
void main()
{
    int *mang,n,check=0,a=0;
    clrscr();
    while(a!=4)
    {
        printf("Menu:\n");
        printf("1. Nhap N (0 -> 100)\n");
        printf("2. Nhap mang nguyen N phan tu\n");
        printf("3. In ra mang nguyen vua nhap\n");
        printf("4. Thoat\n\n");
        scanf("%d",&a);
        switch(a)
        {
            case 1:
                if(check==0)
                {
                    nhap(&n);
                    check=1;
                }
                else
                {
                    printf("Ban da nhap N roi\n");
                }
                break;
            case 2:
                if(check==1)
                {
                    mang=(int*)malloc(n*sizeof(int));
                    if(mang!=0)
                    {
                        nhapmang(mang,n);
                        check=2;
                    }
                    else
                    {
                        printf("Ko du bo nho\n");
                    }
                }
                else
                {
                    printf("Ban chua nhap N hoac da nhap mang roi\n");
                }
                break;
            case 3:
                if(check==2)
                {
                    printf("Mang vua nhap la:\n");
                    inmang(mang,n);
                }
                else
                {
                    printf("Ban chua nhap mang\n");
                }
                break;
            case 4:
                break;
            default:
                printf("Chon ko hop le\n");
                break;
        }
        getch();
    }
    free(mang);
}