C program to print palindrome triangle pattern

  • Write a program in C to print print palindrome triangle pattern of n rows.
  • How to print a right triangle of palindrome strings using for loops.
Palindrome triangle pattern of 5 rows:
A
ABA
ABCBA
ABCDCBA
ABCDEDCBA

Required Knowledge

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 Kth row is always 2K-1. 1st row contains 1 character, 2nd row contains 3 characters, 3rd 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. 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.

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 = 1; i <= 2*rows; i=i+2) {
      for (j = 1; 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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