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// khai bao thu vien ham
#include<math.h>
#include <iostream>
 
using namespace std;
 
int main()
{
    // khai bao
    int a[100], n;
 
    // 1- Nhập vào từ bàn phím dãy số nguyên dương có n số (3<n<100)
    cout<<"\n + Nhap so phan tu cua mang: ";
    do{
        cout<<"\n n= "; cin>>n;
        if(n<=3||n>=100)
            cout<<"\n Nhap lai n ! ";
    }while(n<=3||n>=100);
 
    cout<<"\n Nhap mang: ";
    for(int i=0; i<n;i++)
       {
           do{
               cout<<"\n a["<<i<<"]= ";
               cin>>a[i];
               if(a[i]<0)
                   cout<<"\n Nhap lai a["<<i<<"]!";
           }while(a[i]<0);
       }
 
    // 2- In dãy số vừa nhập
    cout<<"\n + In day mang: ";
    int i=0;
    while(i<n){
        cout<<a[i]<<", ";
        i++;
    }
 
    //3- Đếm số phần tử là số chẵn có trong dãy
    int demSoChan=0;
    i=0;
    while(i<n)
    {
        if(a[i]%2==0) demSoChan++;
        i++;
    }
    cout<<"\n + Dem so chan trong mang: "<<demSoChan;
 
    // 4- Tính tổng các số > 5 trong dãy
    long tong=0;
    for(i=0;i<n;i++)
        if(a[i]>5)
            tong=tong+a[i];
    cout<<"\n + Tong cac so lon hon 5: "<< tong;
 
    //  5- Tìm số lớn nhất có trong dãy
    int max=a[0];
    for(i=1;i<n;i++)
        if(max<a[i]) max=a[i];
 
    cout<<"\n + Max = "<<max;
 
    // 6- Đếm số phần tử là bội của 3 và 5 có trong dãy
    int demBoi3va5=0;
    for(i=0;i<n;i++)
        if(a[i]%3==0&&a[i]%5==0)
            demBoi3va5++;
    cout<<"\n + Dem boi cua 3 va 5: "<<demBoi3va5;
 
    // 7- In ra tất cả số nguyên tố trong dãy
    cout<<"\n + In so nguyen to trong day: ";
 
    for(i=0;i<n;i++)
    {
        int test=0;
        if(a[i]==1||a[i]==2||a[i]==3)
            cout<<a[i]<<", ";
        else
        {
            for(int j=2;j<a[i];j++)
                if(a[i]%j==0)
                {
                    test=1;
                    break;
                }
            if(test==0)
                cout<<a[i]<<", ";
        }
    }
 
    cout<<"\n - END -  \n";
    return 0;
}

Main.java:2: error: illegal character: '#'
#include<math.h>
^
Main.java:2: error: class, interface, or enum expected
#include<math.h>
        ^
Main.java:3: error: illegal character: '#'
#include <iostream>
^
Main.java:7: error: class, interface, or enum expected
int main()
^
Main.java:13: error: class, interface, or enum expected
    cout<<"\n + Nhap so phan tu cua mang: ";
    ^
Main.java:14: error: class, interface, or enum expected
    do{
    ^
Main.java:15: error: class, interface, or enum expected
        cout<<"\n n= "; cin>>n;
                        ^
Main.java:16: error: class, interface, or enum expected
        if(n<=3||n>=100)
        ^
Main.java:18: error: class, interface, or enum expected
    }while(n<=3||n>=100);
    ^
Main.java:20: error: class, interface, or enum expected
    cout<<"\n Nhap mang: ";
    ^
Main.java:21: error: class, interface, or enum expected
    for(int i=0; i<n;i++)
    ^
Main.java:21: error: class, interface, or enum expected
    for(int i=0; i<n;i++)
                 ^
Main.java:21: error: class, interface, or enum expected
    for(int i=0; i<n;i++)
                     ^
Main.java:25: error: class, interface, or enum expected
               cin>>a[i];
               ^
Main.java:26: error: class, interface, or enum expected
               if(a[i]<0)
               ^
Main.java:28: error: class, interface, or enum expected
           }while(a[i]<0);
           ^
Main.java:29: error: class, interface, or enum expected
       }
       ^
Main.java:33: error: class, interface, or enum expected
    int i=0;
    ^
Main.java:34: error: class, interface, or enum expected
    while(i<n){
    ^
Main.java:36: error: class, interface, or enum expected
        i++;
        ^
Main.java:37: error: class, interface, or enum expected
    }
    ^
Main.java:41: error: class, interface, or enum expected
    i=0;
    ^
Main.java:42: error: class, interface, or enum expected
    while(i<n)
    ^
Main.java:45: error: class, interface, or enum expected
        i++;
        ^
Main.java:46: error: class, interface, or enum expected
    }
    ^
Main.java:50: error: class, interface, or enum expected
    long tong=0;
    ^
Main.java:51: error: class, interface, or enum expected
    for(i=0;i<n;i++)
    ^
Main.java:51: error: class, interface, or enum expected
    for(i=0;i<n;i++)
            ^
Main.java:51: error: class, interface, or enum expected
    for(i=0;i<n;i++)
                ^
Main.java:54: error: class, interface, or enum expected
    cout<<"\n + Tong cac so lon hon 5: "<< tong;
    ^
Main.java:57: error: class, interface, or enum expected
    int max=a[0];
    ^
Main.java:58: error: class, interface, or enum expected
    for(i=1;i<n;i++)
    ^
Main.java:58: error: class, interface, or enum expected
    for(i=1;i<n;i++)
            ^
Main.java:58: error: class, interface, or enum expected
    for(i=1;i<n;i++)
                ^
Main.java:61: error: class, interface, or enum expected
    cout<<"\n + Max = "<<max;
    ^
Main.java:64: error: class, interface, or enum expected
    int demBoi3va5=0;
    ^
Main.java:65: error: class, interface, or enum expected
    for(i=0;i<n;i++)
    ^
Main.java:65: error: class, interface, or enum expected
    for(i=0;i<n;i++)
            ^
Main.java:65: error: class, interface, or enum expected
    for(i=0;i<n;i++)
                ^
Main.java:68: error: class, interface, or enum expected
    cout<<"\n + Dem boi cua 3 va 5: "<<demBoi3va5;
    ^
Main.java:71: error: class, interface, or enum expected
    cout<<"\n + In so nguyen to trong day: ";
    ^
Main.java:73: error: class, interface, or enum expected
    for(i=0;i<n;i++)
    ^
Main.java:73: error: class, interface, or enum expected
    for(i=0;i<n;i++)
            ^
Main.java:73: error: class, interface, or enum expected
    for(i=0;i<n;i++)
                ^
Main.java:76: error: class, interface, or enum expected
        if(a[i]==1||a[i]==2||a[i]==3)
        ^
Main.java:78: error: class, interface, or enum expected
        else
        ^
Main.java:80: error: class, interface, or enum expected
            for(int j=2;j<a[i];j++)
                        ^
Main.java:80: error: class, interface, or enum expected
            for(int j=2;j<a[i];j++)
                               ^
Main.java:84: error: class, interface, or enum expected
                    break;
                    ^
Main.java:85: error: class, interface, or enum expected
                }
                ^
Main.java:88: error: class, interface, or enum expected
        }
        ^
Main.java:92: error: class, interface, or enum expected
    return 0;
    ^
Main.java:93: error: class, interface, or enum expected
}
^
53 errors

Standard output is empty