File handling in c
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This document discusses file handling in C programming. It begins by introducing the concept of files and how they are used to store data on disk rather than temporarily in memory. It then covers key functions for working with files like fopen() to open a file, fclose() to close it, fprintf() and fscanf() to write and read data from files. The different modes for opening files are explained, including reading, writing, and appending. An example program is provided that demonstrates opening a file, writing data to it, rewinding to the start, reading the data back, and closing the file. Basic file handling is an important concept for persistent storage of data in programs.
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PPS PPT 2.pptx
File handling in C allows programs to permanently store and retrieve large amounts of data from files. Files must be opened before use and closed after to ensure data is properly written. Basic file operations include opening, reading, writing, and closing files. Functions like fopen open a file and return a file pointer. fread and fwrite can read and write arrays of data. An example shows merging two text files containing numbers into a single output file by comparing the numbers and writing the smaller value.
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This document discusses file handling in C programming. It describes the high level and low level methods of performing file operations in C using functions like fopen(), fclose(), getc(), putc(), fprintf(), fscanf(), getw(), putw(), fseek(), and ftell(). It explains how to open, read, write, close and perform random access on files. Functions like fopen(), fclose() are used to open and close files while getc(), putc(), fprintf(), fscanf() are used to read and write data from files.
Data file handling
1) The document discusses file handling in C++ using fstream. Files allow storing data permanently unlike cin and cout streams.
2) Files can be opened using constructor functions or member functions like open(). open() allows specifying the file mode like read/write.
3) Reading and writing to files can be done using extraction/insertion operators, get()/put(), or read()/write() functions depending on data types. Member functions help check file status and position.
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File handling in c
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- 3. Week Target Achieved 1 30 20 2 30 21 3 30 Typing Speed
- 4. File handling in c Yasirmusthafapp yasirmusthafapp@gmail.com www.facebook.com/yasirmusthafa twitter.com/yasirmusthafapp in.linkedin.com/in/yasirmusthafapp 8891396749
- 5. Console application • Traditional I/O system • Text based interface(black windows screen) • User executes the program and output displayed on the screen
- 6. Draw back of traditional I/O • Data is temporary • Not available during re-execution
- 7. Introduction to file handling • Data is stored onto the disk • Retrieve whenever required • Output –stored on to the disk
- 8. File • Sequence of bytes where group of related data is stored • Collection of bytes interpreted as Single character Single word Single line Complete structure
- 9. File (conti) • Last byte of file contains end of file character (EOF) • Can be used to check to know the end • Structure pointer of file type –to declare a file Eg:-FILE *fp Fp=fopen();
- 10. File handling • Fopen() -create or open a file • Fclose() -close a file • Getc() -reads a character from a file • Putc() -writes a character to a file • Fscanf() -reads a set of data from a file • Fprintf() -writes a set of data to a file • Getw() -reads an integer from a file • Putw() -writes an integer to a file • Fseek() -set the position to desire point • Ftell() -gives current position in the file • Rewind() -set the position to the begning
- 11. Two kindes of files • Text(ASCII) • Binary(non ASCII) -image,audio,vedio,executable,etc
- 12. Fopen() • To create a new file or to open an existing file Syntax Fopen(filename,mode); Eg:-fp=fopen(“data.txt”,”r”); Return NULL-unable to open
- 13. modes 1. r –opens file for reading 2. w-creates a file writing , over writes on previous content(delete) 3. a-opens a file for appending-writing on the end of file • “+” character-read & write • Can add a “b” character(non asci) –file is a binary -”rb” , ”wb” or “ab”
- 14. Fclose() • Close an opened file Syntax Fclose(pointer_name); Eg:-fclose(fp); • Return zero on success • Return EOF on error
- 15. Writing to a file&Reading data from a file Fprintf() & fscanf() • Just like printf() & scanf() Eg:-fprintf(fp,”babtra”); Eg:-fscanf(fp,”%s”,variable); • Except-first argument:file pointer Fputs()&fgets() Fputc()&fgetc()
- 16. Example #include<stdio.h> void main() { char name[50]; FILE *fp; fp=fopen("yasir.txt","r+"); fprintf(fp,"hello_yasirn"); rewind(fp); fscanf(fp,"%s",name); printf("%s",name); fclose(fp); }
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