String Manipulations In C Programming Using Library Functions

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.


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.

Video: C String Functions

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