Question

****NOTE YOU MUST USE SYSTEM CALL I/O, meaning STANDARD I/O IS NOT ALLOWED

Write a C program using system call I/O to determine how many lines there are in a text file.

Answer 1

Answer:

Code:

#include <stdio.h> 
#define MAX_FILE_NAME 100 
  
int main() 
{ 
    FILE *f; 
    int count = 0;  
    char filename[Your_file_name]; 
    char ch;  
  
    // Get file name from user. The file should be 
    // either in current folder or complete path should be provided 
    printf("Enter file name: "); 
    scanf("%s", filename); 
  
    // Open the file 
    f = fopen(filename, "r"); 
  
    // Check if file exists 
    if (f == NULL) 
    { 
        printf("Could not open file %s", filename); 
        return 0; 
    } 
  
    // Extract characters from file and store in character c 
    for (ch = getc(f); ch != EOF; ch = getc(f)) 
        if (ch == '\n') // Increment count if this character is newline 
            count = count + 1; 
  
    // Close the file 
    fclose(f); 
    printf("The file %s has %d lines\n ", filename, count); 
  
    return 0; 
} 

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