C program to reverse the contents of a file
scanf ( "%s" , filename);. Read the entire contents as one C string. read(file1, &buffer, 1); should be fread(*buffer, 1, size, file1); because you opened file1 with fopen , so it's printf ( "Enter the filename to open for writing \n" );. Then the program tells the position of each character in the file and prints the file contents in reverse order on the terminal. if (fptr2 == NULL). Line 3 tells the preprocessor to include the contents of the standard input/output header (<stdio. strrev( ) function reverses a given string in C language. An easy way to reverse a file is by using stream iterators, std::vector and std:: reverse_copy(). Rewind the file. #include <stdio. printf ( "Enter the filename to open \ n" );. Feb 4, 2017 Just off the top of my head, without testing, I see these bugs: buffer = malloc(size); should be *buffer = malloc(size); because buffer is a pointer to pointer to char , you need to dereference it once. {. 6. But now that I implemented the print_reversed_string function and wrote the code to reverse the contents of the file in there it still compiles but when I run it it just shows: "Original Text: To be or not to be". } printf ( "\ nContents int main(). . program to reverse the contents of a file; reversing contents of a file using file pointer; fs program for reversing thre file content Greetings, Anyone have a bit of C code that will read a text file and output the There are a number of things in the program I'd probably do Oct 8, 2010 I have a following problem with my C program: user can choose the following menu options to manipulate a file. while (c != EOF). FILE *fptr;. h> #include<fstream>Write a function reverse that reverses the character string s; use it to write a program that reverses its input a line at a time */ #include<stdio. If my Unix system supported the -r Jun 3, 2013 is a directive to the C preprocessor. tac command displays contents of the file in reverse order Feb 4, 2017 Just off the top of my head, without testing, I see these bugs: buffer = malloc(size); should be *buffer = malloc(size); because buffer is a Open the file. Display the string. } // Read contents from file. Write a c program for concatenation two strings without using string. Here we read the file name and n are specified on the command line. 1. h> #define int main(void) { int len; char line[MAXLINE]; while((len=mgetline(line,MAXLINE))>0) { reverse(line); printf("%s",line); } return 0; } int mgetline(char s[],int lim) { int i,c; for(i=0 May 28, 2013 Here is source code of the C Program to reverse the contents of a file and print it. exit (0);. h> // to count the total number of characters inside the source file long count_characters(FILE *); void main() { int i; long cnt; This program will print the contents of given file name in reverse order. txt"); int p=in. Call strrev, passing the string as an argument. My file-reversal needs. So we need to copy the contents of a file into another file than we will use “fstream”, it has functions capable of both reading & writing in the file. c = fgetc (fptr);. Just like tac command in Linux. fptr2 = fopen (filename, "w" );. For my situation I needed to (a) get 10 lines from the end of a file, (b) reverse those ten lines, and (c) save them to another file. Reverse each line of the file, 4. seekg(-i,ios::end); If the file isn't too large, it would be easier to read the entire file contents into memory, reverse them, and then output. if (fptr == NULL). The C program is successfully compiled and run on a Linux system. fptr = fopen (filename, "r" );. The code: printf ( "Enter the filename to open for writing \n" );. h> #include<errno. K = *argv[2] - 48 Step 7: read the item from file C Program to Replace a Specific Line in a Text File - #include int main(void) { FILE *fp1, *fp2; //'filename'is a 40 character string to store filename char filename; char from user and stores in 'filename' scanf("%s", filename); fp1 = fopen(filename, "r"); //open file in read mode c = getc(fp1); //print the contents of file . h>. { char fname[MAXSTRING]; int c;. NOTE: both the text file has to be present initially. If you have a file with this name, you should change its name or move it because when we execute this program, its contents will be erased. h> #include<fstream> using namespace std; main() { char c; int i; ifstream in; in. It is fairly easy, once you understand how lseek works. open("efg. Jun 4, 2011 This program shows how ftell() and fseek() functions are used to move file pointer through a file. fputc (c, fptr2);. Lines beginning with # are processed by the preprocessor before compilation. Here is source code of the C Program to reverse the contents of a file and print it. txt", "r")) { printf("The FILE has been opened\n"); fp2 = fopen("File_2. Nov 20, 2014 The following is a C code for copying the contents of one file in reverse order in another file. */ Code: #include<iostream> #include<conio. The program output is also shown below. // Open another file for writing. c = fgetc (fptr1);. Find code solutions to questions for lab practicals and assignments. /*; * C Program to Reverse the Contents of a File and #include<stdio. FILE *ifp; fprintf( stdin Tags for Reverse a file in C++. Example program for strrev() function in C: In below program, string “Hello” is reversed using Nov 10, 2015 C Programs · Printf and Scanf · Switch Case · If Else · Loops · Series · Arrays · Arrays & Strings · Functions · Function without recurssion · function recurssion · Dynamic Memory Allocation · Structure and Union · File Handling · Command Line Arguments · Data Structure · DSUC_Array · Stack · Queue · Linked Jan 18, 2006 printf("Enter the string to reverse - "); scanf("%s",str);/*Read contents of string*/ reverse(str);/*Function call by using str */ return 0; } reverse(char str[10]) /*Function to reverse string*/ int i,j; char c; j=0; while (str[j]!=' ') /* Total count of characters*/ j++; j--;/*Exact count including Array index 0, reduce total count “fstream" class is used for both reading and writing a file. #include # include #include char buffer[1]; int main() { int fd1,fd2; //the two file descriptors char file1[50],file2[50]; printf("Enter file to reverse: "); gets(file1);… Oct 21, 2014 Step 1: Start Step 2: read the command line arguments Step 3: check if arguments = 3 or not If not print invalid no of arguments Step 4: open source file in read mode Step 5: if NULL pointer, then print file can not be open Step 6: Store no of chars to reverse in k. printf ( "Cannot open file %s \n" , filename);. Code>: Programming & Web Development Community. . return 0;. printf ( "%c" , c);. Syntax for strrev( ) function is given below. Online C Files I/O programs for computer science and information technology students Copy contents of one file to another in reverse order: </Dream. Search: Advanced Program that prints file contents in reverse order. printf ( "Cannot open file \n" );. Display the file, 3. char *strrev(char *string);. K = *argv[2] - 48 Step 7: read the item from file Oct 13, 2011 C Program to reverse the first n characters in a file using the command line arguments. // Open file. The C program is successfully compiled and run on a Linux #include<stdio. Select a text file, 2. If file exists, it reverse the n characters, else it gives the error message. Feb 9, 2015 C program to read a text file and display the contents on screen. txt", "w"); cnt = count_characters(fp1); C Language Source Codes (C programs) - C program to print contents in reverse order of a file (just like TAC command in Linux), TAC command implementation in c, how to implement tac command in c language? C language programs, c language examples, solved c programs, print contents of a file in reverse order in c C Program to create text file & print content of file in reverse order. while (c !=Jun 3, 2016 Working on a Unix system, I just needed to reverse the contents of a file, and thought I'd show how I ended up doing it. this program first takes some text input from user and prints to a file. This header contains information used by the compiler when compiling calls String reverse using strrev in c programming language . h>) in the program. char filename[100], c;. Also note that the input file will be copied in memory entirely. This must be done because stream iterators can't go in reverse, unfortunately. strrev( ) function is non standard function which may not available in standard library in C. h> // to count the total number of characters inside the source file long count_characters(FILE *); void main() { int i; long cnt; char ch, ch1; FILE *fp1, *fp2; if (fp1 = fopen("File_1. h header file. Note that this has nothing to do with file open modes. } printf ( "\nContents I had gotten the program to work when I implemented everything in the main space. May 28, 2013 This C Program reverses the contents of a file and print it. And it seems to me Oct 21, 2014 Step 1: Start Step 2: read the command line arguments Step 3: check if arguments = 3 or not If not print invalid no of arguments Step 4: open source file in read mode Step 5: if NULL pointer, then print file can not be open Step 6: Store no of chars to reverse in k. #define MAXSTRING 100 int main(). In. } Nov 5, 2013 #include<iostream> #include<conio. If you don’t have a Prev Next. Online C Files I/O programs for computer science and information technology students pursuing BE, BTech, MCA, MTech, MCS, MSc, BCA, BSc. tellg(); for(i=1;i<p;i++) { in. This program accepts the name of the file to be read as a command line argument. printf ( "Cannot open file %s \n" , filename);. C Program to create text file & print content of file in reverse order. } fclose (fptr);. Write a C program that take input 5 diferent student from user and save them in file using standard io by arranging them in ascending order by name while each record contain Sep 13, 2008 Files handling in C - C programming language can handle files as Stream-oriented data (Text) files and System oriented data (Binary) files. Read more about C Programming Language
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