Programming in C uses a collection of characters and various present functions to simplify lengthy coding processes into short and precise functions for easy implementation. These functions make handling easy for programmers to equip multiple operations within limited characters and manipulate the strings. Diverse programming languages contain their in-built functions, ready to use on a whim for precision. 

Today, we will discuss the C programming language string and its functions to grab an in-depth insight into the diverse string functions, their uses, benefits, and other functionalities which make it dynamic to work along for programmers. 

What is string

The string is present in diverse programming languages, though c processes string differently than usual programming languages. In C language, a string is a one-dimensional array of characters where each string character takes up one location in an array. The string is ended with a null character defined by ‘\0’, which refers to the end of any string. 

Let’s take a look at the character and string representation:

char string[10] = {‘w’,’e’,’l’,’c’,’o’,’m’,’e’,’\0’};
char string[10] = “welcome”;
char string []= “welcome”;

Ending a string with a null character is important to recognize the sequence of characters as a string. Otherwise, it is simply a sequence of characters without the null terminator. Note that strings are enclosed within double quotes, while single quotation marks enclose characters in a sequence. Declaring the string as string[10] allocates 10 bytes of the string, while string[] allocates memory during program execution.

Learn Software Development Courses online from the World’s top Universities. Earn Executive PG Programs, Advanced Certificate Programs or Masters Programs to fast-track your career.

Declaration of String

As mentioned above, strings are declared using two different methods. C is a statistical language that is one-dimensional. Therefore, string variables require a declaration to attach a particular meaning to any string. 

For example- char temp[]=” temp string”;

Strings of char type, when declared within double quotes, then ‘\0’ is directly applied at the end of the string to end it. It can also be expressed as char temp[]=” temp string”;

• The character declared as ‘string[6]’  will hold 6 bytes of memory to allocate string values. On the other hand, declaration as ‘string[]’ will allocate space as per the requirement through the program’s execution. 

Initialization of String

Process of declaration and initialization go hand in hand where declaration declares the existence of a variable and initialization assigns value to it. Initialization of strings in c has many ways to implement. Here are a few of them:

• char t[]=” temp string”;
• char t[10]=” temp string”;
• char t[]={‘t’,’e’,’m’, ‘d’,’\0’};
• char t[5]={‘t’,’e’,’m’, ‘d’,’\0’};

String Functions in C

string functions in C programming language are included to simplify dealing with string handling. String functions refer to a sequence of sentences that perform specific tasks. These functions can be reused in diverse strings to simplify string handling, enabling the usage of the same set of instructions in different coding patterns. Many programmers reap benefits from string functions to save time on rewriting codes several times. Here are the advantages of using string functions:

• Reduced size of the code
• Enhanced readability
• Easier debugging process
• Improved reusability of the code allowing programmers to use similar functions without needing to write the code from scratch.

Types of String Functions

Instead of using complex code sequences to manipulate codes, different in-built string functions can be used to handle strings that are stored in a standard string handling functions library of C language, called the ‘string.h’. 

Here are some common string handling functions:

1. Function printf() and scanf()

scanf() function is used to take input from the users until it faces whitespace or end.

For example:

#include <stdio.h>
int main()
{
    int testInteger;
    printf(“Enter an integer: “);
    scanf(“%d”, &testInteger);  
    printf(“Number = %d”,testInteger);
    return 0;
}

Output:

Enter an integer: 4

Number = 4

printf() function directs formatted output to the screen, printing both the string and variables.

For example:

#include <stdio.h>    
int main()
{ 
    // Displays the string inside quotations
    printf(“C Programming”);
    return 0;
}

Output:

C Programming