PROGRAM TO PRINT FOLLOWING OUTPUT..

A
B B
C C C
D D D D
E E E E E

INPUT--

 #include <iostream>
using namespace std;
int main()
{
    int i,j;
    char input,temp='A';
    cout<<"Enter uppercase character you want in triange at last row: ";
    cin>>input;
    for(i=1;i<=(input-'A'+1);++i)
    {
        for(j=1;j<=i;++j)
           cout<<temp<<" ";
        ++temp;
        cout<<endl;
    }
    return 0;

}

OUTPUT--

Enter uppercase character you want in triange at last row:

A

B B

C C C

D D D D

E E E E E