C Tutorials

C Array copy example
The example below contains two arrays: array1 and array2 with sizes 5 respectively. Here the size of an array states its capacity to hold maximum number of values.
To declare an array in C, you have to specify the name of the data type and the number of elements inside the square brackets.
C Array default values
The example below contains an array arr of integer type. The maximum size of the array is 4.
C Array length example
An array is a contiguous group of data items with the same name and data type. In order to get the length of an array, we have used the sizeof operator.
C array of pointers
A pointer is a variable that contains the memory location of another variable. Th e values you assign to the pointers are memory addresses of other variables (or other pointers).
C array sort example
For sorting an array, we have used the qsort function. This function provides the implementation of quicksort algorithm to sort the elements of an array .
C String length
In this section, you will learn how to determine the length of a String in C. You can see in the given example, we have declared a string and initialize a variable i to 0.
C Break with Switch statement
The switch case statements allows to control complex conditional and branching operations. It include any number of case instances, but should not have the same value.
C Break for loop
The break statement terminates the execution of the enclosing loop or conditional statement. In a for loop statement, the break statement can stop the counting when a given condition becomes true.
C break continue example
The continue statement provides a convenient way to force an immediate jump to the loop control statement. The break statement terminates the execution of the loop.
Array of String using Pointers
The declaration of an array of character pointers is an extremely useful extension to single string pointer declarations. In the example below, A two element array of character pointers where each element is a pointer to a character.
C Array of String
A String is an array of char objects. An array of string can be declared and handled like a 2d(two dimensional) arrays. You can see in the given example that we have declare a 2 dimensional character array consisting of three 'rows' and twelve 'columns'.
C String to Int
In this section, you will learn how to convert a string represented value into an integer represented value in C.
C define Macro
Macros are the identifiers that represent statements or expressions. To associate meaningful identifiers with constants, keywords, and statements or expressions, #define directive is used.
C Current Time
The header file <time.h> provides all date and time functions. In the given example, the time() function determines the current time in seconds and assigns it to time_t type variable t.
C String Remove Spaces
In this section, you will study how to remove spaces from the string. You can see in the given example, we have define the string and passed it into two character pointers.
C Pointer to a function
C provides a special feature of pointer to a function. As you know that every function defined in C language have a base address attached to it.
C Multiple Indirection
C permits the pointer to point to another pointer. This creates many layers of pointer and therefore called as multiple indirection. A pointer to a pointer has declaration is similar to that of a normal pointer but have more asterisk sign before them.
C Goto Statement
The goto statement is a jump statement which jumps from one point to another point within a function. The goto statement is marked by label statement.
C GMT Time
In this section, you will study how to get the gmt time in C. GMT stands for Greenwich Mean Time. In the given example, the time() function determines the current time in seconds and assign it to t.
C file write example
Here we are using the library function fwrite() to write the data into the file. You can see in the given example, we have stored the string into the buffer which is to be written into the specified file 'Hello.txt'.
C file rename
This section illustrates you to rename a file in C. You can see in the given example that we want to replace the name of the text file MYFILE.txt with HELLO.txt.
C file read example
This section demonstrates you to read a line from the file. You can see in the given example, we prompt the user to enter the name of the file to read.
C file open example
The header file <stdio.h> provides several functions related to file operations. Here we are going to open a file using library function fopen(). You can see in the given example, we have used the type FILE in order to store the information related to file stream.
C file Last Modified Date
You can see in the given example that we want to get the last modified date of the specified file Hello.txt. For this, we have defined the library function strftime() provided by the header file <time.h> that formats the time represented in the structure according to the formatting rules defined in format and stored into t.
C file delete example
This section illustrates you to delete a file in C. You can see in the given example that we want to remove the file HELLO.txt. For this, we have used the library function remove() which deletes the file HELLO.txt.
C Dynamic Array
The dynamic array is an array data structure which can be resized during runtime which means elements can be added and removed. You can see in the given example that we prompt the user to enter the number of elements that he want to set into the array.
C String Copy
In this section, you will learn how to copy the string in C. You can see in the given example, two string variables st1 and st2 are created. A string is passed to the st1.
C String Concatenation
In this section you will study how to concatenate the two strings in C. You can see in the given example, we have declared two strings in order to combine the strings.
C String Compare
In this section, you will learn how to compare two strings. You can see in the given example, the program prompts the user to enter the two strings one by one.
C Replace String
Here a function pointer replace is created in which variables st, orig, repl of pointer type are declared. The st represents the string, orig represents the substring which is to be replaced and repl represents the replaced substring.
C String lowercase
In this section, you will study how to convert the string to lowercase. You can see in the given example, we have define a string in uppercase characters.
C String Join
In this section, you will learn how to join the strings. You can see in the given example, we have define two strings and initializes two integer variables length1 and length2 to 0.
C get Substring from String
This section illustrates you how to get the substring using library function. You can see in the given example, we have used the library function strstr() provided by the header file <string.h>.
C Temperature Converter
Here we are going to illustrates you how to convert temperature from Celsius to Fahrenheit in C. You can see in the given example, we prompt the user to enter the temperature in celsius.
C Structure Pointer
This section illustrates you the concept of Structure Pointer in C. You can see in the given example, we want to access the employee's information through structure pointer.
C Structure example
Structures in C defines the group of contiguous (adjacent) fields, such as records or control blocks. A structure is a collection of variables grouped together under a single name.
C String uppercase
In this section, you will learn how to convert a string value in to uppercase. In the given example, we have define a string in lowercase characters.
C String Tokenizer
In this section, you will learn how to use strtok() function to break the string into a series of tokens. You can see in the given example, we have define a string and a pointer.
C String Substring
In this section, you will learn how to get the substring from a string in C. You can see in the given example, a string and a method substring() is created.
C String Reverse
In this section, you will study how to reverse a string. You can see in the given example, a recursive function reverse(int i) is created. Inside the method, we are calculating the length of a specified string using a library function strlen().