pattern printing 1 a b 1 2 3 a b c d code example

Example: Write a program to print following pattern; 1 1 2 1 2 3 1 2 3 4

#include <stdio.h>
int main() {
   int i, j, rows;
   printf("Enter the number of rows: ");
   scanf("%d", &rows);
   for (i = 1; i <= rows; ++i) {
      for (j = 1; j <= i; ++j) {
         printf("%d ", j);
      }
      printf("\n");
   }
   return 0;
}