C Foundation

What is C? C Compiler Installation C Extensions C Compiler C Interpreter C Program Structure

C Basics

C Keywords C Data Types C Identifiers C Variables C Constant C Escape Sequences C Constant and Volatile C Typecast

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

Looping

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

Storage Classes

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

All ASCII Code Basic C Questions

C Interview

C Interview Sets All Star Patterns All Number Patterns All Alphabet Patterns All Series Patterns
The ones who are crazy enough to think they can change the world are the ones who do.
- Steve Jobs

C Error Handling

In C programming, the error may occurred while writing into a file or reading from a file.

ferror() - Error Handling

The ferror() function is used detect error while reading or writing a file.

C program - ferror()

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

ferror.c
#include <stdio.h>
int main()
{
char ch[100];
FILE *fptr;     //File pointer declaration
fptr = fopen("info.txt", "w ");     //the function fopen opens the text file
fputs("This function is used to change the position of file pointer", fptr);
fseek(fptr, 5, 0);
fgets(ch, 50, fptr);
if(ferror(fptr))
printf("\nError:Reading a file is not allowed in write mode. ");
fclose(fptr);     //the function closes the opened file
return 0;
}
  • Error:Reading file not allowed.

Note:

The ferror function used to find out the errors during writing and reading a file.

perror() - Error Handling

The perror() function is used to display errors which are specified by compilers.

C program - perror()

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

perror.c
#include <stdio.h>
int main()
{
char ch[100];
FILE *fptr;     //File pointer declaration
fptr = fopen("info1.txt", "r ");     //the function fopen opens the text file
if(fptr == NULL)
{
perror("folk text file ");
}
fclose(fptr);     //the function closes the opened file
return 0;
}
  • folk text file:No such file or directory

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