C Foundation

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Operators

What is Operator C Comma Operator C Arithmetic Operators C Relational Operators C Logical Operators C Bitwise Operators C Conditional Operators C : : Operator C Operator Priority

Basic IO's

Basic IO's C Formatted Functions C Unformatted Functions C Common Functions

Control Statements

What is Control Statement C if Statement C if else Statement C Nested if Statement C Else if Statement C Break Statement C Continue Statement C Switch Statement C Goto Statement

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What is Control Loop C for Loop C Nested for Loop C while Loop C Nested while Loop C do while Loop C Nested do while loop

Functions

What is Function C User Defined Functions C Recursion C Passing Parameters

Scope

Scope C Local Scope C Global Scope

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What is Storage Class C Auto C Extern C Static C Register

Array

What is Array C One Dimensional Array C Two Dimensional Array C Multi Dimensional Array C Arrays Of Strings

String

What is String C String Functions

Pointer

What is Pointer C Pointers Arithmetic C Pointer to Pointer C Pointers and Arrays C Pointers and Strings C Pointer to Functions Void Pointers Null Pointers C Null and Void Pointer

Structure

What is Structure C Struct within Struct C Array within Structure C Pointer to Structure C Structure and Function C Enum C Bitfield Structure C Type def

Union

What is Union

Files

What is File C read a file C write a file C File Handling C Error Handling C Low Level Disk I/O C Other file functions

Memory Allocation

What is Memory Allocation C Malloc() C Calloc() C Free() C Realloc() C Coreleft()

C Reference

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The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs
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C File Read

The following functions are used to read data from the files.

  • fscanf()
  • fgetc()
  • fgets()

Files - fscanf()

The fscanf() function is used to read the sequence of characters, integers, floats, etc. from a file by using appropriate format specifier of data type.

C program - fscanf()

Lets try to code using fscanf() and have some fun.

fscanf.c 
#include <stdio.h>
int main()
{
FILE *fptr;     //File pointer declaration
char name[40], name1[40];
fptr = fopen("record.txt", "r+");     //the function fopen opens the record text file
printf("\nEnter your name : ");
scanf("%s", name);
fputs(name,fptr);    //the entered name is written in to the file
rewind(fptr);    //returns pointer to the starting point of the file
fscanf(fptr, "%s ", name1);    //reads the name from file
printf("Name reads from File : %s", name1);
fclose(fptr);     //the function closes the opened file
return 0;
}
  • Enter your name : John
  • Name reads from File : John

Note:

The rewind function resets the pointer to the starting point of a file.

Files - fgetc()

The fgetc() function used to read a single character from a file. It can read only one character at a time.

C program - fgetc()

Lets try to code using fgetc() and have some fun.

fgetc.c 
#include <stdio.h>
int main()
{
FILE *fptr;     //File pointer declaration
char name[40], ch;
fptr = fopen("record.txt", "r+");     //the function fopen opens the record text file
printf("\nEnter your Name : ");
scanf("%s", name);
fputs(name, fptr);
rewind(fptr);
printf("Name : ");
while((ch=fgetc(fptr))!=EOF)     //the fgetc function reads a character from the file
{
putchar(ch);
}
fclose(fptr);     //the function closes the opened file
return 0;
}
  • Enter your Name : Jiju
  • Name : Jiju

Note:

The program illustrates that the fgetc function reads the character one by one and print the character one by one using putchar function.

Files - fgets()

The fgets() function used to read a string from a file.

C program - fgets()

Lets try to code using fgets() and have some fun.

fgets.c 
#include <stdio.h>
int main()
{
FILE *fptr;     //File pointer declaration
char name[40];
fptr = fopen("record.txt", "w");     //the function fopen opens the record text file
printf("\nEnter your name : ");
scanf("%s", name);
fputs(name, fptr);
rewind(fptr);
fgets (name1, 40, fptr );    //reads the string from the file
prinf("Name : %s", name);
fclose(fptr);     //the function closes the opened file
return 0;
}
  • Enter your name : Jiju
  • Name : Jiju

Note:

From the above program the fgets() function reads a string from a file record.txt. The integer parameter inside the fgets function is the total number of characters that the user wants to read from a file.

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