C Tutorial

C Tutorial C Language Environment Setup Execution flow of C program C printf and Scanf C Data type C Token Variable in C Operators in C Comments in C Escape Sequence in C C – Storage Classes C Decision control statement Loop Statement in C Break, continue and goto statement in C Type Casting in C Function in C Recursion in C String in C C Array Pointer in C Dynamic memory allocation C –Structure Nested Structure in C Union in C File Handling in C C pre-processor Static Function In C Sizeof In C Selection Sort In C Scope Of Variables In C Runtime Vs Compile Time In C Random Access Lseek In C Queue Implementation In C Pseudo Code In C Prototype In C Pointer To Pointer In C Pointer Arithmetic In C Passing Array To Function In C Null Character In C Merge Sort In C Macros In C Library Functions In C Memory Leak In C Int In C Goto And Labels In C Fibonacci Series In C Fflush In C Derived Data Types In C Data Types In C Const Vs Volatile In C Character Set In C Character Class Tests In C Calloc In C C Pointers Arrays In C Include In C Clrscr In C C Vs Java String Literals In C Types Of Pointers In C Variables In C Volatile In C Why C Is A Middle Level Language Infix To Postfix Program In C Ceil function in C LCM of two numbers in C Quick sort in C Static in C function pointer as argument in C Top Array Keywords in C Add two numbers using the function in C Armstrong program in C using function Array, Declaring Arrays and Array Initialization Limitations of Inline Function in C Merge and Merge sort with example in C Do-While Loop in C For Loop in C While-Loop in C Difference between while and do-while loop in C Array Of Structures in C Data Structures And Algorithms in C Types Of Structures In C How to Avoid Structure Padding in C Use of Structure in C Do WHILE LOOP in C Programming Examples For Loop in C Programming Examples Entry Control Loop in C Exit control loop in C Infinite loop in C Nested loop in C pow() function in C String Handling functions in C Prime Number code in C Factorial Program in C using For Loop Factorial Program in C Using While Loop Fibonacci Series in C Using For Loop Fibonacci series in C using while loop Prime Number Program in C using for Loop While Loop in C programming examples Built-in functions in C Assert() Function C vs Java Strings Call Back Function in Embedded C Else If Ladder fgets() function Ftell() Function getc() function getch() function gets() function Heap Sort Nested if-else statement Pi() Function Positioning of file Write() function abs() function in C Attributes in C C program to find factorial of a number using Recursion Ferror() in c fopen() function in C Fibonacci series program in C using Recursion Formatted Input and output function in C Snake Game in C User Defined Functions in C Beep() function in C Cbrt() function in C Hook() function in C Isalnum() function in C C Program to find the Roots of a Quadratic Equation C Switch Statements Difference between rand() and srand() function in C Difference between while and for loop in C Doubly Linked list in C Example of Iteration in C How to use atoi() function in C How to use floor() function in C How to use sine() function in C How to use Typedef Struct in C Integer Promotions in C C Program to Find Largest Number Using Dynamic Memory Allocation C Program to Find the Largest Number using Ternary Operator C/C++ Program to Find the Size of int, float, double and char Find the Largest Three Distinct Elements in an Array using C/C++ Loop Questions in C Modulus on Negative Numbers in C Multiplication table program in C using For loop Nested Loops in C Programming Examples C Program for Mean and Median of an Unsorted Array Results of Comparison Operations in C and C++ Reverse a Stack using Recursion in C Simple hash() function in C strcat() Function in C Sum of N numbers in C using For loop Use of free() function in C Write a program that produces different results in C and C++

File Handling in C

File Handling is used to open, read, write, search and close file.  C files I/O functions handles data on secondary storage device. File handling function: There are varioushandling functions in C.

Function Operation
fopen() It is used to create a file.
fclose() It is used to create close an existing file.
getc() It is used to read a character from a file.
putc() It is used to write a character in file.
fprintf() It is used to write set of data in file.
fscanf() It is used to read set of data from file.
getw() It is used to read an integer from a file
putw() It is used to write an integer in file.

C fopen() function The fopen() function is used to open a file.The given syntax of file opening is. Syntax
FILE *fopen( const char * filePath, const char * mode );
Let us consider an example
#include<stdio.h>
int main()
{
    FILE *fp;
    fp = fopen("fileName.txt","w");
    return 0;
}
Here is filePath declare a variable as a pointer to the data type FILE. There are different type of modes that help us to access the file in the fopen() function.

Mode Description
r It is used to open a text file in read mode.
W It is used to open a text file in write mode.
a It is used to open a text file in append mode.
r+ It is used open a text file in read and write mode.
w+ It is used open a text file in read and write mode.
a+ It is used open a text file in read and write mode.
rb It is used open a binary file in read mode.
wb It is used open a binary file in write mode.
ab It is used open a binary file in append mode.
rb+ It is used open a binary file in read and write mode.
wb+ It is used open a binary file in read and write mode.
ab+ It is used open a binary file in read and write mode.

C fclose() function: The fclose() function is used to close a file . Following is the syntax of fclose() function Syntax:
char fclose( FILE *fp);
Example
#include<stdio.h>
int main(){
    FILE *fp;
    fp = fopen("fileName.txt","w");
    fprintf(fp, "%s", "Hello we are learning C langauge  from TutorialAndExample
.com");
    fclose(fp);
    return 0;
}
  • The above example will call the < filename> name.
  • The wis used to open for writing, and if the file does not exist then new file will be created.
  • The fprintf function writes text on the file.
  • The fclosefunction closed the file and reassesses the memory stream.
C getc() function In C language, getc() function is  library function that is used to read a character from a file. Synatx:
int getc( FILE * stream );
Example
#include<stdio.h>
int main(){
  FILE *fp = fopen("fileName.txt", "r");
  int ch = getc(fp);
  while (ch != EOF){
    /* To display the contents of the file on the screen */
    putchar(ch);
    ch = getc(fp);
  }
 if (feof(fp))
     printf("\n Reached the end of file.");
  else
     printf("\n Something gone wrong.");
  fclose(fp);
  getchar();
  return 0;
}
Cfputc() function In C language, fputc() function is used to write a character to the file. Syntax:
int fputc( int c, FILE * stream );
#include <stdio.h>
int main(){ 
   FILE *fp; 
   /* file open */
   fp = fopen("myfilee.txt", "w");   
   /* writing single character into file */
   fputc('a',fp);
   fclose(fp); 
}
C fprintf()function: The C printf() function is used  to write the characters into file. Syntax:
int fprintf(FILE *stream, const char *format [, argument, ...])
Example
#include <stdio.h>
main(){ 
   FILE *fp; 
   fp = fopen("myfilee.txt", "w"); 
   fprintf(fp, "Helloworld  file by fprintf...\n"); 
   fclose(fp);
}
C fscanf()function: The C fscanf() is used to read the characters from file. It reads a word from the file and returns EOF at the end of file. Syntax:
int fscanf(FILE *stream, const char *format [, argument, ...])
Example
#include <stdio.h>
int main(){ 
   FILE *fp; 
   char buff[255]; 
   fp = fopen("myfilee.txt", "r"); 
   while(fscanf(fp, "%s", buff)!=EOF){ 
   printf("%s ", buff ); 
   } 
   fclose(fp); 
}

C fputs() function C fputs() function is used to write a line of characters into file  and return outputs string to a stream. Syntax:
int fputs(const char *s, FILE *stream)
Example
#include<stdio.h>
int main(){ 
FILE *fp; 
fp=fopen("myfilee.txt","w"); 
fputs("Hello You are Good Programmer .",fp); 
fclose(fp); 
return 0;
}

C fgets() function The fgets() functionis used to read a line of character from file and get string from a stream. Syntax: char* fgets(char *s, int n, FILE *stream)  Example
#include
int main(){
FILE *fp;
char text[200];
fp=fopen("myfilee.txt","r");
printf("%s",fgets(text,100,fp));
fclose(fp);
return 0;
}
Output :
Hello You are Programmer



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