Program 34 - CSU1128 - CSE 2026 - Shoolini University

Program to count the number of words in the sentence entered by the user. Example: This is dmj.one and you are learning about a code made in C: Total Words = 14

Explanation

The program counts the number of words in a sentence entered by the user. Words are separated by spaces, tabs, or newlines.

Header

The code begins with including the standard input-output header file and the string header file using #include <stdio.h> and #include <string.h> for string manipulation functions.

Variable Declaration

The main() function is defined, and a character array d and an integer variable j are declared:

char d[100];: Declares a character array to hold the user's sentence.
int j = 0;: Initializes a variable to count the number of words.
int len;: Declares a variable to store the length of the entered sentence.

Program Description

The program prints a description message for the user to understand its functionality.

User Input

The user is prompted to enter a sentence. The input is read using fgets(d, sizeof(d), stdin); to include spaces:

fgets(d, sizeof(d), stdin);: Reads the sentence including spaces and stores it in the character array d.

Word Count Calculation

The program calculates the number of words in the entered sentence:

int len = strlen(d);: Calculates the length of the entered sentence.
for (int m = 0; m < len; m++): Loops through each character in the sentence.
if (d[m] == ' ' || d[m] == '\t' || d[m] == '\n'): Checks if the current character is a space, tab, or newline.
j++;: Increments the word count if a space, tab, or newline is found.

Output Result

The program prints the total number of words counted:

printf("Number of words: %d\n", j);: Prints the number of words in the entered sentence.

Program End

The program ends with return 0; to indicate successful execution.

Code

                    
/*
 * -----------------------------------------------------------
 * Logic Building with Computer Programming (CSU1128)
 * Instructor: Dr. Pankaj Vaidya | Author: Divya Mohan
 * 
 * This code is a part of the educational initiative by dmj.one
 * with aim of empowering and inspiring learners in the field of
 * Computer Science and Engineering through the respective courses.
 * 
 * (c) 2022, Divya Mohan for dmj.one. All rights reserved.
 * -----------------------------------------------------------
 */

#include <stdio.h>
#include <string.h>
int main()
{
    char d[100];

    printf("\n\n Program to count the number of words in the sentence entered by the user. Example: This is dmj.one and you are learning about a code made in C: Total Words = 14. \n\n");

    printf("Enter a sentence: ");
    fgets(d, sizeof(d), stdin); // Read the sentence, including spaces

    // Count the number of words in the d
    int j = 0;
    int len = strlen(d);
    for (int m = 0; m < len; m++)
    {
        if (d[m] == ' ' || d[m] == '\t' || d[m] == '\n')
        {
            // If the current character is a space, tab, or newline, increment the word count
            j++;
        }
    }

    // Print the result
    printf("Number of words: %d\n", j);

    return 0;
}

Output

Program to count the number of words in the sentence entered by the user. Example: This is dmj.one and you are learning about a code made in C: Total Words = 14.

Enter a sentence: This is a demo sentence.
Number of words: 5