#include <stdio.h>
#include <conio.h>
int Cong(int a,int b)
{
    return a+b;
}
void Hello()
{
     printf("Hello");
}
bool SNT(int n)
{
     for(int i=2;i<n;i++)
             if(n%i==0) return false;
     return true;
}
main()
{
      printf("\n*****************************");
      printf("\n*           MENU            *");
      printf("\n*   Bai Hello bam phim 1    *");
      printf("\n*    Bai SNT bam phim 2     *");
      printf("\n*    Bai Cong bam phim 3    *");
      printf("\n*****************************");
      char Nhap;
      scanf(" %c",&Nhap);
      if(Nhap=='1') Hello();
      else if(Nhap=='2')
      {
           int SoMoi;
           printf("\nMoi nhap so can kiem tra: ");
           scanf("%d",&SoMoi);
           if(SNT(SoMoi)==true) printf("\nSo %d la SNT",SoMoi);
           else printf("\nS %d ko phai la SNT",SoMoi);
      }
      else if(Nhap=='3')
      {
           int SoThuNhat, SoThuHai;
           printf("\nMoi nhap 2 so can cong: ");
           scanf("%d %d", &SoThuNhat,&SoThuHai);
           printf("%d + %d = %d",SoThuNhat,SoThuHai,Cong(SoThuNhat,SoThuHai));
      }
      else
      {
          printf("\nChon menu ko dung");
      }
      getch();
}
#include <stdio.h>
#include <conio.h>
int Cong(int a,int b)
{
    return a+b;
}
void Hello()
{
     printf("Hello");
}
bool SNT(int n)
{
     for(int i=2;i<n;i++)
             if(n%i==0) return false;
     return true;
}
main()
{
      printf("\n*****************************");
      printf("\n*           MENU            *");
      printf("\n*   Bai Hello bam phim 1    *");
      printf("\n*    Bai SNT bam phim 2     *");
      printf("\n*    Bai Cong bam phim 3    *");
      printf("\n*****************************");
      char Nhap;
      scanf(" %c",&Nhap);
      if(Nhap=='1') Hello();
      else if(Nhap=='2')
      {
           int SoMoi;
           printf("\nMoi nhap so can kiem tra: ");
           scanf("%d",&SoMoi);
           if(SNT(SoMoi)==true) printf("\nSo %d la SNT",SoMoi);
           else printf("\nS %d ko phai la SNT",SoMoi);
      }
      else if(Nhap=='3')
      {
           int SoThuNhat, SoThuHai;
           printf("\nMoi nhap 2 so can cong: ");
           scanf("%d %d", &SoThuNhat,&SoThuHai);
           printf("%d + %d = %d",SoThuNhat,SoThuHai,Cong(SoThuNhat,SoThuHai));
      }
      else
      {
          printf("\nChon menu ko dung");
      }
      getch();
}