CodingUnit Programming Tutorials » C Tutorials

C Tutorial – Searching for Strings in a Text File

admin — Wed, 12 May 2010 06:00:16 +0000

In this C language tutorial we will show you how to search for a string in a text files. We will make use of command-line input, fopen or fopen_c and system to clear the screen. Make sure that you have read and understand the following tutorial C tutorial File I/O using Text Files before you [...]

C Tutorial – Searching for Strings in a Text File is a post from: CodingUnit Programming Tutorials

How to make a Calendar in C

admin — Wed, 03 Feb 2010 16:31:55 +0000

In the C tutorial “How to use Time and Date in C” some people asked questions in the comment section about determining dates and day of the week. That’s why we created this tutorial to show you what things you have to lookout for, such as leap years. Gregorian Calendar and Leap Years The Gregorian [...]

How to make a Calendar in C is a post from: CodingUnit Programming Tutorials

Writing Memory to a File and Reading Memory from a File in C

admin — Thu, 23 Jul 2009 08:53:53 +0000

In this C programming language tutorial we will look at how to save content from an allocated piece of memory to a (binary) file. We also read it back from a (binary) file into memory and display the content. Because the program example is longer than the usual examples that we use in our tutorials, [...]

Writing Memory to a File and Reading Memory from a File in C is a post from: CodingUnit Programming Tutorials

How to use Time and Date in C

admin — Thu, 23 Jul 2009 08:36:41 +0000

In today’s C programming language tutorial we take a look at how to use time and date from C programs. To make use of time and date function you need to include the time.h header file from the standard C library. This header file contains functions and macros that provide standardized access to time and [...]

How to use Time and Date in C is a post from: CodingUnit Programming Tutorials

C Tutorial – Command Line Parameter Parsing

admin — Thu, 23 Jul 2009 07:30:37 +0000

In this tutorial we take another look at command line parameter parsing with C programs. In a previous command line parameter tutorial we already looked at some simple command line argument parsing example. Please read that tutorial before advancing below. More Complex Command Line Parameter Parsing Example Command-line parameters can be used for many things. [...]

C Tutorial – Command Line Parameter Parsing is a post from: CodingUnit Programming Tutorials

C Tutorial – Copying a File

admin — Thu, 23 Jul 2009 07:25:48 +0000

In a previous tutorial we already talked about renaming and removing a file. In this C programming language tutorial we look at how to copy a file. Let’s look at an example: #include<stdio.h> int copy_file(char *old_filename, char *new_filename) { FILE *ptr_old, *ptr_new; errno_t err = 0, err1 = 0; int a; err = fopen_s(&ptr_old, old_filename, [...]

C Tutorial – Copying a File is a post from: CodingUnit Programming Tutorials

C Tutorial – Deleting and Renaming a File

admin — Thu, 23 Jul 2009 07:21:51 +0000

In two previous tutorials we talked about file I/O functions on text files and file I/O functions on binary files. In this C programming language tutorial we look at how to remove files and how to rename a file. Remove a File With function remove() we can delete a file. Let us take a look [...]

C Tutorial – Deleting and Renaming a File is a post from: CodingUnit Programming Tutorials

C Tutorial – Binary File I/O

admin — Thu, 23 Jul 2009 07:17:33 +0000

In an earlier tutorial we talked about file I/O functions and the use of text files. In this C programming tutorial we are going to talk about the use of binary files. Binary files Binary files are very similar to arrays of structures, except the structures are in a disk-file rather than an array in [...]

C Tutorial – Binary File I/O is a post from: CodingUnit Programming Tutorials

C Tutorial – The functions malloc and free

admin — Thu, 23 Jul 2009 07:11:42 +0000

The function malloc is used to allocate a certain amount of memory during the execution of a program. The malloc function will request a block of memory from the heap. If the request is granted, the operating system will reserve the requested amount of memory. When the amount of memory is not needed anymore, you [...]

C Tutorial – The functions malloc and free is a post from: CodingUnit Programming Tutorials

C Tutorial – File I/O (using text files)

admin — Thu, 23 Jul 2009 08:06:47 +0000

The file I/O functions and types in the C language are straightforward and easy to understand. To make use of these functions and types you have to include the stdio library. (Like we already did in most of the tutorials). The file I/O functions in the stdio library are: fopen – opens a text file. [...]

C Tutorial – File I/O (using text files) is a post from: CodingUnit Programming Tutorials