Here is a C program to print palindrome triangle pattern of n rows. Palindrome triangle pattern of 5 rows:

Required Knowledge
Algorithm to print triangle pattern of palindrome strings
This program is silimar to right triangle star pattern program.
This program is silimar to right triangle star pattern program.
- Take the number of rows(N) of right triangle as input from user using scanf function.
- Number of characters in Kth row is always 2K+1. 0th row contains 1 character, 1st row contains 3 characters, 2nd row contains 5 charcaters and so on.
- In any row, we will first print the characters in increasing order of their ASCII value till mid of the row and then in decreasing order.
- We will use two for loops to print right triangle of palindrome strings.
- Outer for loop will iterate N time(from i = 0 to 2N-2 in increment of 2). Each iteration of outer loop will print one row of the pattern.
- Each iteration of inner loop will print a palindrome string as explained above.
Here is the matrix representation of the above mentioned pattern. The row numbers are represented by i whereas column numbers are represented by j.

C program to print palindrome triangle pattern
#include<stdio.h> int main() { int i, j, rows, count=0; printf("Enter the number of rows\n"); scanf("%d", &rows); for (i = 0; i < 2*rows; i=i+2) { for (j = 0; j <= i; j++) { printf("%c", 'A'+count); if(j < i/2) count++; else count--; } count = 0; printf("\n"); } return(0); }Output
Enter the number of rows 5 A ABA ABCBA ABCDCBA ABCDEDCBA
Related Topics