- To print sideway triangle pattern using numbers
User Input: 3
Output:
A A B A B C A B A
#include <iostream>
using namespace std;
int main() {
int columns,trows,k=1;
char c;
cout<<"Enter number of columns: ";
cin>>columns;
trows=2*columns-1;
for(int i=1; i<=trows; i++) {
c='A';
for(int j=1; j<=k; j++) {
cout<<c++<<" ";
}
if(i<columns)k++;
else k--;
cout<<endl;
}
return 0;
}
Enter number of columns: 4 A A B A B C A B C D A B C A B AProgram
Main Logic :
trows=2*columns-1; // trows : total rows to print
k=1; // Used to trigger decreasing order of alphabet
for(int i=1; i<=trows; i++) {
c='A';
for(int j=1; j<=k; j++) {
cout<<c++<<" ";
}
//check for position change at which triangle alphabet value to decrease
if(i<columns)k++;
else k--;
cout<<endl;
}
You can print the same pattern in small alphabets, just set c='a'
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