C file peek9/20/2023 ![]() ![]() This size is arbitrary and you can increase or decrease it as needed. First, we declare a character array of size 256 characters to hold the name of the file.In this program, we have used C-style file handling to open the file and count the number of lines into it.Let us now implement a program using the getc() function to count the number of lines in a file in C++. C++ Program to Count Lines In A File using C-style approach We will use the same file used above for counting the number of lines. In the end, we break from the loop when the end of file (EOF) character is found. The getc() function takes the file name as input and returns the next character in the file. Here, we will read the characters from the file using the getc() function. Each time we find a newline character, we consider it to have completed a line and we increase the count of lines in the file. In this method, instead of reading each line at a time, we read each character at a time and check if the character is a newline character ( \n). The fopen() method accepts two arguments, the first argument is a character array denoting the filename and the second argument is the parameter indicating the mode of opening the file. For this, we can open a file using the fopen() method and store the file pointer to a FILE pointer object. We can use C-style file handling to read the file and count the number of lines in it. There is an alternative way to count the number of lines in a file in C++. How To Count Lines In A File In C++ Using C-style Approach? Until we reach the end of the file, we read the file line by line and increase the count. Here we check if the next character to be read is the EOF (end of file) character or not, using the peek() method. We then read the file in a loop using the peek() method and the getline() function.If so, we are ready to read the file otherwise we will display a message to the user that the file hasn’t been opened. ![]() Then we check if the file has been successfully opened using the is_open() method.In the next line, we open the file using the ifstream object constructor by passing the name of the file into the constructor.Next, we have declared a line variable to read each line from the file and a ‘count’ variable to keep the count of the number of lines in the file.The program handles errors in opening the file by showing an appropriate message when for some reason the file could not be opened using the.If the file is not present in the directory as the code file then provide a complete path of the file for the program to work correctly. The user is prompted to enter the name of the file which he or she wants to read and count lines in it. We have declared a string variable to input the filename.In this program, we have used the ifstream constructor to create the file stream object to open the file.After that, it advances the file pointer. Upon execution, it reads the next line in the file stream into the string variable. The getline() function takes a file stream as its first argument and a string variable as its second argument. Once the file is open we will read the file line by line using the getline() function and count the number of lines. To count the lines in a file in c++, we will open the file in the read mode only as there are no output operations needed. In this article, we will discuss how to count the number of lines in a file. In applications such as text editors, line numbers are usually mentioned before each line of the file. You may need to count the number of lines in a file on various occasions. The files store text data line by line where each line can have multiple characters and words. Files can be used to store many types of data including text, numbers, images, etc. We often store our data into files when we need the data to be persistent and written into the hard disk. C++ Program to Count Lines In A File using C-style approach.How To Count Lines In A File In C++ Using C-style Approach?. ![]()
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