How to Split a String into an Array in C++?
Last Updated :
04 Mar, 2024
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In C++, splitting a string into an array of substrings means we have to parse the given string based on a delimiter and store each substring in an array. In this article, we will learn how to split a string into an array of substrings in C++.
Example:
Input: str= “Hello, I am Geek from geeksforgeeks” Delimiter= ’ ’ Output: Hello, I am Geek from geeksforgeeks
Splitting a String into an Array in C++
To split a string into an array of substrings in C++, we can use the std::istringstream class from the <sstream> library to create an input stream from the string. We can then split the string based on some delimiter using getline() and store them into the array of strings.
Approach
- Create an input string stream from the input string using
std::istringstream. - Iterate through the stream, using
std::getlineto extract each substring separated by the delimiter. - Add the extracted substring to the array.
- Print the array of substrings.
C++ Program for Splitting a String into an Array
The below example demonstrates how we can split a given string into an array of substrings in C++.
// C++ Program to illustrate how to split a string into an
// array of substrings
#include <iostream>
#include <sstream>
#include <string>
using namespace std;
// Function to split a string into tokens based on a
// delimiter
void splitString(string& input, char delimiter,
string arr[], int& index)
{
// Creating an input string stream from the input string
istringstream stream(input);
// Temporary string to store each token
string token;
// Read tokens from the string stream separated by the
// delimiter
while (getline(stream, token, delimiter)) {
// Add the token to the array
arr[index++] = token;
}
}
int main()
{
// Input string
string input = "Hello, I am Geek from Geeksforgeeks";
// Delimiter
char delimiter = ' ';
// Array to store the substrings
string arrayOfSubStr[100];
// Index to keep track of the number of substrings
int index = 0;
// Calling the function to split the input string into
// an array of substrings
splitString(input, delimiter, arrayOfSubStr, index);
// Print the array of substrings
for (int i = 0; i < index; i++) {
cout << arrayOfSubStr[i] << endl;
}
return 0;
}
// C++ Program to illustrate how to split a string into an// array of substringsusing namespace std;// Function to split a string into tokens based on a// delimitervoid splitString(string& input, char delimiter, string arr[], int& index){ // Creating an input string stream from the input string istringstream stream(input); // Temporary string to store each token string token; // Read tokens from the string stream separated by the // delimiter while (getline(stream, token, delimiter)) { // Add the token to the array arr[index++] = token; }}int main(){ // Input string string input = "Hello, I am Geek from Geeksforgeeks"; // Delimiter char delimiter = ' '; // Array to store the substrings string arrayOfSubStr[100]; // Index to keep track of the number of substrings int index = 0; // Calling the function to split the input string into // an array of substrings splitString(input, delimiter, arrayOfSubStr, index); // Print the array of substrings for (int i = 0; i < index; i++) { cout << arrayOfSubStr[i] << endl; } return 0;}Output
Hello, I am Geek from Geeksforgeeks
Time complexity: O(N), here N is the length of the input string.
Auxiliary Space: O(N)
