C String Functions

C-Tutorial

C Introduction

C Keywords and identifiers

C Variables,constant and literals

C Datatype

C Input &Output (I/O)

C Operators

C if and if else Statements

C for loop

C while and do while loop

C break and continue

C switch statement

C goto statement

C functions

C user-defined functions

C Types of user-defined functions

C Recursion

C Storage class

C Arrays

C Pointers

C Pointers and Array

C Pointers and Function

C Memory allocation

C String

C String Functions

C Structure

C Structure and Pointers

C Structure and Function

C Union

C File input/output(I/O)

C Enumuration

C Preprocessor and Macros

C Standard library function

In this article, you’ll learn to manipulate strings in C using library functions such as gets(), puts, strlen() and more. You’ll learn to get string from the user and perform operations on the string.

You need to often manipulate strings according to the need of a problem. Most, if not all, of the time string manipulation can be done manually but, this makes programming complex and large.

To solve this, C supports a large number of string handling functions in the standard library "string.h".

Few commonly used string handling functions are discussed below:

Function	Work of Function
strlen()	computes string’s length
strcpy()	copies a string to another
strcat()	concatenates(joins) two strings
strcmp()	compares two strings
strlwr()	converts string to lowercase
strupr()	converts string to uppercase

Strings handling functions are defined under "string.h" header file.

#include <string.h>

Note: You have to include the code below to run string handling functions.

gets() and puts()

Functions gets() and puts() are two string functions to take string input from the user and display it respectively as mentioned in the previous chapter.

#include<stdio.h>

int main()
{
    char name[30];
    printf("Enter name: ");
    gets(name);     //Function to read string from user.
    printf("Name: ");
    puts(name);    //Function to display string.
    return 0;
}

Note: Though, gets() and puts() function handle strings, both these functions are defined in "stdio.h" header file.

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