C Exercises: Extract words of 3 to 6 characters length from a given sentence

C Basic Declarations and Expressions: Exercise-146 with Solution

Write a C program to extract words of 3 to 6 characters length from a given sentence not more than 1024 characters.

Internet search engine giant, such as Google accepts web pages around the world and classify them, creating a huge database. The search engines also analyze the search keywords entered by the user and create inquiries for database search. In both cases, complicated processing is carried out in order to realize efficient retrieval, but basics are all cutting out words from sentences.

Input:
English sentences consisting of delimiters and alphanumeric characters are given on one line.

Sample Solution:

C Code:

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>

int main() {
  // Define an array to store input text
  char input_text[1536];

  // Initialize a counter variable
  int ctr = 0;

  // Define a pointer variable 'temp'
  char * temp;

  // Prompt user for input
  printf("English sentences consisting of delimiters and alphanumeric characters on one line:\n");

  // Read a line of text from the user
  fgets(input_text, sizeof(input_text), stdin);

  // Print message indicating the purpose of the operation
  printf("\nExtract words of 3 to 6 characters length from the said sentence:\n");

  // Tokenize the input text using delimiters (space, period, comma, newline)
  for (temp = strtok(input_text, " .,\n"); temp != NULL; temp = strtok(NULL, " .,\n")) {
    const int len = strlen(temp);

    // Check if the length of the word is between 3 and 6 characters
    if (3 <= len && len <= 6) {
      // If not the first word, print a space before the word
      if (ctr++) putchar(' ');

      // Print the word
      fputs(temp, stdout);
    }
  }

  // Print a newline character after the extracted words
  puts("");

  return (0);
}

Sample Output:

English sentences consisting of delimiters and alphanumeric characters on one line:
w3resource.com

Extract words of 3 to 6 characters length from the said sentence:
com

Flowchart:

C programming Code Editor:

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