C program to print palindrome triangle pattern

Write a C program to print palindrome triangle pattern of n rows.

Palindrome triangle pattern of 5 rows:

Required Knowledge

For Loop
If Else Statement
printf and scanf function in C
C Language Palindrome

Algorithm to print triangle pattern of palindrome strings

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 K^th row is always 2K+1. 0^th row contains 1 character, 1^st row contains 3 characters, 2^nd 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 or Palindromic Triangle

#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

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Required Knowledge

C program to print palindrome triangle pattern or Palindromic Triangle

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