Lesson 1

 

#include <iostream>


int main() {
    

   std::cout << "Hello world!"; //print "Hello World"


  return 0;

}

---------------------------------
#include <iostream>

int main(){

    std::cout<<"Hello World!"<<"Hello World!"<<"Hello World!"<<"Hello World!"<<"Hello World!";

return 0;
}
------------------------------------
#include <iostream>

int main(){
    std::cout<<"Hello World!";
    std::cout<<"Hello World!";
    std::cout<<"Hello World!";
    std::cout<<"Hello World!";
    std::cout<<"Hello World!";
return 0;
}
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#include <iostream>

using namespace std;

int main(){
    cout<<"1";
    cout<<"2";
    cout<<"3";
    cout<<"4";
    cout<<"5";
return 0;
}
-------------------------------------
#include <iostream>

using namespace std;

int main(){
    cout<<"1+1=";
    cout<<1+1;
return 0;
}
-------------------------------------


#include <iostream>

using namespace std;

int main() 
{

cout <<"Hello World";

return 0;
}

---------------------
#include <iostream>

using namespace std;

int main(){
    cout<<"1+1=";
    cout<<endl;
    cout<<1+1;
return 0;
}
--------------------
#include <iostream>

using namespace std;

int main(){
    cout<<"1+1=";
    cout<<endl;
    cout<<1+1;
return 0;
}
--------------------
#include <iostream>

using namespace std;

int main(){
    cout<<"1+1="<<endl<<1+1;
return 0;
}
-------------------
#include <iostream>

using namespace std;

int main(){
    
int length;
length=3;

    cout<<"The area of this square is "<<length*length;
return 0;
}
--------------------
#include <iostream>

using namespace std;

int main(){
    
int length;

   cout<<"enter your length: ";
   cin>>length;
   cout<<"The area of your square is "<<length*length;
   
return 0;
}
-------------------
#include <iostream>

using namespace std;

int main(){

int i;
i=1;
for (i;i<4;i=i+1){
    cout<<"*";
}

return 0;
}
-------------------