pattern.cpp

#include <iostream>
using namespace std;

void printPattern(int a,int b){
    if(a==0){
		return;
	}

	printPattern(a-1,b+1);

    for(int i=1;i<=b;i++){
        cout<<' ';
    }
    for(int i=1;i<=a;i++){
        cout<<(char)('A'+i-1);
    }for(int i=a-1;i>=1;i--){
        cout<<(char)('A'+i-1);
    }
    for(int i=1;i<=b;i++){
        cout<<' ';
    }
    cout<<endl;
}

int main() {
	// your code goes here
	//take A=1, B=2, ..... , Z = 26
	// If the largest alphabet to be printed is I,
	// then use its numerical equivalent I = 9
	// and similarly do it for other integers.
	int n;
	char ch;
	cout<<"Enter the largest alphabet present in the pattern: ";
	cin>>ch;
	if(ch>='a' && ch<='z'){
        ch = ch-'a'+'A';
	}
	printPattern((int)(ch-'A'+1),0);
	return 0;
}