w3resource

C Exercises: Read the file and count the number of lines

C File Handling : Exercise-5 with Solution

Write a program in C to Find the Number of Lines in a Text File.

Sample Solution:

C Code:

#include <stdio.h>

#define FSIZE 100
 
int main()
{
    FILE *fptr;
    int ctr = 0;  
    char fname[FSIZE];
    char c; 
    printf("\n\n Read the file and count the number of lines :\n");
	printf("--------------------------------------------------\n"); 
	printf(" Input the file name to be opened : ");
	scanf("%s",fname);

    fptr = fopen(fname, "r");
    if (fptr == NULL)
    {
        printf("Could not open file %s", fname);
        return 0;
    }
    // Extract characters from file and store in character c
    for (c = getc(fptr); c != EOF; c = getc(fptr))
        if (c == '\n') // Increment count if this character is newline
            ctr = ctr + 1;
    fclose(fptr);
    printf(" The lines in the file %s are : %d \n \n", fname, ctr-1);
    return 0;
}

Sample Output:

 Read the file and count the number of lines :                                                                
--------------------------------------------------                                                            
 Input the file name to be opened : test.txt                                                                  
 The lines in the file test.txt are : 4 

Flowchart:

Flowchart: Read the file and count the number of lines

C Programming Code Editor:

Have another way to solve this solution? Contribute your code (and comments) through Disqus.

Previous: Write a program in C to read the file and store the lines into an array.
Next: Write a program in C to find the content of the file and number of lines in a Text File.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.



Share this Tutorial / Exercise on : Facebook and Twitter

C Programming: Tips of the Day

Difference between signed / unsigned char :

There's no dedicated "character type" in C language. char is an integer type, same (in that regard) as int, short and other integer types. char just happens to be the smallest integer type. So, just like any other integer type, it can be signed or unsigned.

It is true that (as the name suggests) char is mostly intended to be used to represent characters. But characters in C are represented by their integer "codes", so there's nothing unusual in the fact that an integer type char is used to serve that purpose.

The only general difference between char and other integer types is that plain char is not synonymous with signed char, while with other integer types the signed modifier is optional/implied.

Ref : https://bit.ly/3esiVjT