This is using basic C and Linux System Calls These library commands wrap corresponding system calls:librarysystemfopenopenfputs, fprintf writefscanf, getlinereadfclosecloseFile Function ExerciseWrite a program names1.c that opens a file names.txt and writes theselines to in this order:Alice talks to Bob.Bob talks to Alice.Eve listens in the middle.Then write a program names2.c which opens this same file, reads the wordsin the file one by one and and prints these words so that the screen outputlooks identical to the content of names.txt (and the display above). One wayto detect the end of a line (for this text) is to check the last character of eachword for a period and add a newline after each period found. (The getlinefunction solves this problem for a general text file.)Finally, write a program names3.c which just prints out the last line in thefile without assuming that there are just three lines. Do this by setting the file-cursor to the last character of the file with fseek, then searching backwardsa character at a time with fscanf with format string "%c" while looking for anewline character (ignoring that at the end of the file). Then use getline toread that last line.

Answered: These library commands wrap…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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This is using basic C and Linux System Calls

These library commands wrap corresponding system calls:
library
system
fopen
open
fputs, fprintf write
fscanf, getline
read
fclose
close
File Function Exercise
Write a program names1.c that opens a file names.txt and writes these
lines to in this order:
Alice talks to Bob.
Bob talks to Alice.
Eve listens in the middle.
Then write a program names2.c which opens this same file, reads the words
in the file one by one and and prints these words so that the screen output
looks identical to the content of names.txt (and the display above). One way
to detect the end of a line (for this text) is to check the last character of each
word for a period and add a newline after each period found. (The getline
function solves this problem for a general text file.)
Finally, write a program names3.c which just prints out the last line in the
file without assuming that there are just three lines. Do this by setting the file-
cursor to the last character of the file with fseek, then searching backwards
a character at a time with fscanf with format string "%c" while looking for a
newline character (ignoring that at the end of the file). Then use getline to
read that last line.

Expert Solution

Program names1.c

#include <stdio.h>
int main(){
FILE *in = fopen("names.text", "r"); // It opens the file
char c;
while((c = fgetc(in)) != EOF){ // till it reaches the end of the file, it will keep on reading the next character
printf("%c", c); // displays the file
}
fclose(in); // close the file

return 0;
}

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