C++ Nested Loops

Program 1

// Nested Loops
#include<iostream>
using namespace std;
int main()
{
    system("cls");
       int i,j;
       for(i=1;i<=5;i++)     
       {
           for(j=1;j<=5;j++)  
           {
              cout<<i + "  " + j;
           }
           cout<<endl;
       }
    return  0;

}  

Program 2

#include<iostream>
using namespace std;
int main()
{
    system("cls");
       int i,j;
       for(i=1;i<=5;i++)     
       {
           for(j=1;j<=5;j++)
           {
              cout<<"i="<<i<<"  j="<<j<<"  ";
           }
           cout<<endl;
       }
    return  0;
}

Program 3

#include<iostream>
using namespace std;
int main()
{
    system("cls");
       int i,j,n;
       cout<<"Enter the limit";
       cin>>n;
       for(i=1;i<=n;i++)       
       {
          for(j=1;j<=i;j++)  
          {
              cout<<"*";
          }
          cout<<endl;
       }
       
    return  0;
}

Program 4

#include<iostream>
using namespace std;
int main()
{
    system("cls");
       int i,j,n;
       cout<<"Enter the limit";
       cin>>n;
       for(i=n;i>=1;i--)        
       {
          for(j=1;j<=i;j++) 
          {
              cout<<"*";   
          }
          cout<<endl;
       }
       
    return  0;
}  
/*
   *****
   ****
   ***
   **
   *
*/