1 code 

#include <cstdlib> #include <iostream> using namespace std; int main(int argc, char *argv[]) {   int arr[10];   int mode[10][2];    cout<<"Nhap 10 so nguyen\n";   for(int l=0;l<10;l++) {     cout<<"Gia tri "<<l<<" la :";cin>>arr[l]; }   //tim gia tri lon nhat va nho nhat  int i,j,temp; //sap xep mang de tim gia tri lon nhat va nho nhat  for(i=0;i<10;i++)  for(j=9;j>i;j--)     if(arr[j]<arr[j-1]) {         int temp=arr[j];          arr[j]=arr[j-1];          arr[j-1]=temp;}                    cout<<"Gia tri lon nhat="<<arr[9]<<"\nGia tri nho nhat="<<arr[0];   cout<<"\n"; //khoi tao mang 2 chieu de sap xep tan suat va gia tri for(i=0;i<2;i++)    for(j=0;j<10;j++)mode[j][i]=0;      mode[0][0]=1;   //tim tan suat  for(i=0;i<10;i++)   for(j=0;j<10;j++)    if(arr[i]==arr[j+1]) {++mode[i][0];mode[i][1]=arr[i];}    //tim so lan suat hien nhieu nhat int max; int k=0; max=mode[0][0];    for(j=0;j<10;j++)     if(max<mode[j][0]){max=mode[j][0];k=j;}     //in ket qua   cout<<"Gia tri xuat hien nhieu nhat la:"<<mode[k][1]<<"\n";   cout<<"Xuat hien "<<max<<" lan.";   cout<<"\n";     return 0; }

2  code 

#include <cstdlib>

#include <iostream>

using namespace std;

void showheading();

int hivalue(int stu[4][5]);

int lovalue(int stu[4][5]);

void displaymenu(){

cout<<"========================================================"<<"\n";

cout<<"                         MENU                                  "<<"\n";

cout<<"========================================================"<<"\n";

cout<<"     1. Quan sat tat ca ban ghi cua sinh vien"<<"\n";

cout<<"     2. Quan sat mot ban ghi cua sinh vien boi ID"<<"\n";

cout<<"     3. Hien thi diem thi cuoi ky cao nhat va thap nhat"<<"\n";

     }

void viewall(int stu[4][5]){

 int i,j;

//Hien thi tieu de

showheading();

 for(i=0;i<4;i++){

   for(j=0;j<5;j++) cout<<stu[i][j]<<"\t\t";

   cout<<"\n";

     }

}

void viewbyid(int stu[4][5]){

     int id,i,j;

     bool l=false;

     cout<<"Nhap ID cua sinh vien:";

     cin>>id;

     for(i=0;i<4;i++){

      if(stu[i][0]==id){

                        showheading();l=true;

                        for(j=0;j<5;j++)cout<<stu[i][j]<<"\t\t";}

       cout<<"\n";}

      if(l==false) cout<<"Xin loi, khong tim thay!\n";

     }

void showhl(int stu[4][5]){

     cout<<"Diem thi cao nhat la:"<<hivalue(stu);

     cout<<"\n";

     cout<<"Diem thi thap nhat la:"<<lovalue(stu);

     cout<<"\n";

     }

void showheading(){

cout<<"========================================================\n";

cout<<"ID     Kiemtra1     Kiemtra2     Giuaky      Cuoiky\n";

cout<<"========================================================\n";

     }

int hivalue(int stu[4][5]){

    int *max,i;

    max=&stu[0][4];

    for(i=0;i<4;i++)

      if(*max<stu[i][4])*max=stu[i][4];

    return(*max);

}

int lovalue(int stu[4][5]){

    int *min,i;

    min=&stu[0][4];

    for(i=0;i<4;i++)

      if(*min>stu[i][4])*min=stu[i][4];

    return(*min);

}

int main(int argc, char *argv[])

{

//xay dung mang hai chieu de luu tru ban ghi cua sinh vien

int stu[4][5]={{6001,7,7,8,9},{6002,6,8,5,8},{6003,5,6,6,7},{6004,8,9,8,9}};

//Hien thi menu

displaymenu();

int yourchoice;

char confirm;

do

{

cout<<"Nhap lua chon cua ban (1-3):";

cin>>yourchoice;

switch(yourchoice){

 case 1:viewall(stu);break;

 case 2:viewbyid(stu);break;

 case 3:showhl(stu);break;

 default:cout<<"Khong hop le";

                   }

cout<<"Nhan y hoac Y de tiep tuc:";

       cin>>confirm;

}while(confirm=='y'||confirm=='Y');

  return 0;

}