Program for printing the half pyramid of * in C++

 Program for printing the half pyramid of * in C++

#include<iostream>

using namespace std;

int main()

{

int r;

int i,j;

cout<<"Enter values for r=";

cin>>r;

for(i=0;i<r;i++)     //this for loop starts from 0 and ends at i=r

{

for(j=i;j>0;j--)  //this for loop starts from at j=i and ends at j=1

{

cout<<"*";  // prints * 

cout<<" ";  //prints space after each *

}

cout<<endl; //enter in new line 

cout<<"\t";  

}

cout<<"\t"; 

}                         

output:

Enter values for r=6

        *

        * *

        * * *

        * * * *

        * * * * *

If we want the inverted half pyramid of * we have to make some changes in the above code in the for loops.

Program for inverted half pyramid :

#include<iostream>

using namespace std;

int main()

{

int i,j,n,m=0;  

cout<<"enter number of rows : ";  //prints the msg in "" between this 

cin>>n;  //stores the value in n

for(i=n;i>=1;--i) // for loop starts with n and ends at 1

{

for(j=1;j<=i;++j)  //starts from 1 and ends at i value

{

cout<<"*"<<" ";  //prints * and space after it

}

cout<<endl;  //new line it works like enter in keyboard

}

return 0;

}

output:

enter number of rows : 6

* * * * * *

* * * * *

* * * *

* * *

* *

*