C++ program to print an lower triangle using stars.

#include<iostream.h>
#include<conio.h>
void main()
{
  int j,i,k,l;
  char c;
  clrscr();
  do
  {
     cout<<"Enter the number of stars in the base..";
     cin>>k;
     for (i=1;i<=k;i++)
     {    
         for (j=1;j<=i;j++)
            cout<<"* ";
         cout<<endl;
     }
     cout<<"\nWant to try more..(y/n)\n";
     cin>>c;
  }
  while(c=='y');
  getch();
}

EQUILATERAL TRIANGLE USING STARS

C++ program to print an equilateral triangle using stars.

#include<iostream.h>
#include<conio.h>
void main()
{
  int j,i,k,l;
  char c;
  clrscr();
  do
  {
     cout<<"Enter the number of stars in the base..";
     cin>>k;
     for (i=1;i<=k;i++)
     {
     for(l=0;l<(k-i);l++)
        cout<<" ";
     for (j=0;j<i;j++)
        cout<<"* ";
     cout<<endl;
     }
     cout<<"\nWant to try more..(y/n)\n";
     cin>>c;
  }
  while(c=='y');
  getch();
}

OUTPUT

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PROGRAM TO PRINT A DIAMOND IN A BOX - 2

C++ program to print a diamond inside a box using asterisks.

#include<iostream.h>
#include<conio.h>
void main()
{
  int i,j,x,n=1,t=1,l;
  clrscr();
  cout<<"Enter limit\n";
  cin>>l;
  x=l/2;
  for(i=0;i<l;i++)
  {
    for(j=0;j<l;j++)
    {
      if(i>0&&i<(l-1))
      {
        if(j>=x&&n>0)
        {
          cout<<"*";
          n-=1;
        }
        else if(i==0||i==(l-1)||j==0||j==(l-1))
        {
          cout<<"*";
        }
        else
        {
          cout<<" ";
        }
      }
      else
      {
        if(i==0||i==(l-1))
        {
          cout<<"*";
        }
      }
    }
    if(i>0&&i<(l/2))
    {
      t=t+2;
      n=t;
      x-=1;
    }
    else
    {
      t=t-2;
      n=t;
      x+=1;
    }
    cout<<endl;
  }
  getch();
}

output

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PROGRAM TO PRINT A DIAMOND IN A BOX - 1

C++ program to print a diamond inside a box using asterisks.

#include<iostream.h>
#include<conio.h>
#include<math.h>
void main()
{
  int i=0,j=0,num;
  clrscr();
  cout<<"Enter limit\n";
  cin>>num;
  cout<<endl;
  for(i=-(num+2);i<=num+2;i++)
  {
    for(j=-(num+2);j<=num+2;j++)
    {
      if(abs(i)+abs(j)<=num||j==-(num+2)
      ||j==(num+2)||i==-(num+2)||i==(num+2))
      {
        cout<<"*";
      }
      else
      {
        cout<<" ";
      }
    }
    cout<<endl;
  }
  getch();
}

output

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   C++ program to print a diamond inside a box  using asterisks.