How to Check if a Substring Exists in a Char Array in C++? Last Updated : 08 Feb, 2024 Comments Improve Suggest changes Like Article Like Report In C++, Char array and std::string both are used to store a sequence of characters to represent textual data. In this article, we will learn how to check if a substring exists within a char array in C++. Example Input: charArray[]= "Hello, Geek" subString="Geek" Output: Geek substring is found in char array: Hello, Geek! Search for a Substring in Char ArrayThe C++ STL provides the std::find() function to search for a given substring in a range of values. If the substring is found, then find() function will return the index of the first occurrence of the given substring.If the substring is not found, then std::string::npos (no position) is returned which indicates that the given substring does not exist in a char array.C++ Program to Search for a Substring in Char Array C++ // C++ program to check if a substring is present in a char // array #include <iostream> #include <string> using namespace std; int main() { // character array char char_arr[] = "Hello, Geek!"; // substring const char* sub_string = "Geek"; // converting character array to string using string string char_arr_str = char_arr; // use the find method to check substring present or not if (char_arr_str.find(sub_string) != string::npos) { cout << sub_string << " substring is found in char array: " << char_arr_str << endl; } else { cout << sub_string << " substring is not found in char array: " << char_arr_str << endl; } return 0; } OutputGeek substring is found in char array: Hello, Geek! Time Complexity: O(N * M), where N is the size of the char array and M is the size of the substring.Auxiliary Space: O(1) We can also use strstr() function to check if a substring exists in a char array or not. Comment More infoAdvertise with us Next Article How to Check if a Substring Exists in a Char Array in C++? S sourabhcao9e0 Follow Improve Article Tags : C++ Programs C++ cpp-string CPP Examples Practice Tags : CPP Similar Reads C++ Programming Language C++ is a computer programming language developed by Bjarne Stroustrup as an extension of the C language. It is known for is fast speed, low level memory management and is often taught as first programming language. It provides:Hands-on application of different programming concepts.Similar syntax to 5 min read Non-linear Components In electrical circuits, Non-linear Components are electronic devices that need an external power source to operate actively. 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