The time complexity of this solution is O (m.n) where m and n are the length of String X and Y . This function returns the address pointer of the first occurrence of the substring which we are searching if found in the main string, else it will return a null when the substring is not present in the main string. Let's see an example code to understand the usage of the strstr in C. #include <stdio.h>. Return HAYSTACK if NEEDLE is empty, otherwise NULL if NEEDLE is not found in HAYSTACK. Iterative Implementation. How to print repeating substring/patterns in a given string using C - Quora strstr implementation in c without using library function Example: strchr () function in C. In this example, we have a string and we are searching a character 'u' in the string using strchr () function. strcat implementation in c geeksforgeeks The strcpy() function is defined in the string.h header file. The template should be correct but there is sth wrong with my code. Repost suitable messages in case PAT does not […] Operations on String without using built-in functions in C Design . The search does not include terminating null characters. C. String is the character array, usually we work with library functions to read and print the complete string but here you will find set of solved c programs/examples based on string manipulation.We will play with the strings and make all programs without using string.h header file. The strcmp() function is used to compare two strings two strings str1 and str2 . Here we'll see how to find out the number of occurrences of a substring in a string. strchr () function can also be used to check the presence of a character in a string. The syntax for the strstr function in the C Language is: char *strstr(const char *s1, const char *s2); Parameters or Arguments s1 A string to search within. The strcpy () function copies one string into another. it's possible that the library functions will be so much faster than explicit iteration that despite the redundancy this approach wins. Basic Syntax of the itoa () function in C/C++. The arguments and return value of wcsstr are wide-character strings; those of _mbsstr are multibyte-character . C Language | string.h | strlen() | strcpy() | strcat() | strcmp ... Input : str [] = 'My name is Ayush', ch1 = 'A', ch2 = 'z'. Here we will discuss how to use string function in C programming with the help of examples. Here we will access and manipulate each character from the character array (string) and then will print the string . Here's simple C Program to find Length of String without using strlen function in C Programming Language.