**for n=5 ;**

pattern:

pattern:

**a**

a A

a A b

a A b B

a A b B c

a A

a A b

a A b B

a A b B c

#include <iostream>

using namespace std;

int main()

{

int i,j,k;

char x,z;

//input from user

cout<<"Enter a number ";

cin>>k;

for(i=1;i<=k;i++)

{

x=65;

z=97;

for(j=1;j<=i;j++)

{

if(j%2==0)

{

cout<<x;

x=x+1;

using namespace std;

int main()

{

int i,j,k;

char x,z;

//input from user

cout<<"Enter a number ";

cin>>k;

for(i=1;i<=k;i++)

{

x=65;

z=97;

for(j=1;j<=i;j++)

{

if(j%2==0)

{

cout<<x;

x=x+1;

if(x>91)

{

x=65;

}

}

else

{

cout<<z;

z=z+1;

if(z>123)

{

z=97;

}

}

}

cout<<"\n";

}

return 0;

}