C Exercises: Array fill, replace each subsequent position of the array by one-third value of the previous

Last update on September 19 2025 12:44:49 (UTC/GMT +8 hours)

Replace array elements with one-third of the previous

Write a C program that reads an array (length 10), and replaces the first element of the array by a given number and replaces each subsequent position of the array by one-third the value of the previous.

Sample Solution:

C Code:

#include <stdio.h>
int main ()
{
  int i;
  double array_nums[10];
  double n;

  // Prompt user for input
  printf("Input a number:\n");
  scanf("%lf", &n);

  // Initialize the first element of the array with the input value
  array_nums[0] = n;

  // Loop to generate and store subsequent array elements
  for (i = 1; i < 10; i++)
  {
    n = n / 3;  // Divide the current value by 3
    array_nums[i] = n; // Store the result in the array
  }

  // Print the array elements
  printf("\nArray elements:\n");
  for (i = 0; i < 10; i++)
  {
    printf("array_nums[%d] = %.4lf\n", i, array_nums[i]);
  }

  return 0; // End of program
}

Sample Output:

Input a number:
35

Array elements:
array_nums[0] = 35.0000
array_nums[1] = 11.6667
array_nums[2] = 3.8889
array_nums[3] = 1.2963
array_nums[4] = 0.4321
array_nums[5] = 0.1440
array_nums[6] = 0.0480
array_nums[7] = 0.0160
array_nums[8] = 0.0053
array_nums[9] = 0.0018

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to modify an array so that each element (after the first) is one-third of its predecessor using loops.
• Write a C program to implement a function that updates an array with each element equal to one-third the previous element.
• Write a C program to use pointer arithmetic to replace each element in an array with one-third of the preceding element.
• Write a C program to recursively update an array where every element becomes one-third of the previous value.

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