String Manipulations In C Programming Using Library Functions

Strings are often needed to be manipulated by programmer according to the need of a problem. All string manipulation can be done manually by the programmer but, this makes programming complex and large. To solve this, the C supports a large number of string handling functions.

There are numerous functions defined in "string.h" header file. Few commonly used string handling functions are discussed below:

FunctionWork of Function
strlen()Calculates the length of string
strcpy()Copies a string to another string
strcat()Concatenates(joins) two strings
strcmp()Compares two string
strlwr()Converts string to lowercase
strupr()Converts string to uppercase

Strings handling functions are defined under "string.h" header file, i.e, you have to include the code below to run string handling functions.

#include <string.h>

gets() and puts()

Functions gets() and puts() are two string functions to take string input from user and display string respectively as mentioned in 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;

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