How to remove Substring from a String in C++

In the previous article, we have discussed about What is a Memory Leak in C++ ?. Let us learn how to remove Substring from a String in C++ Program.

Removing a Substring from a String in C++

In this article we will learn how to remove the substring form a string . Removing of substring can be done many ways . A simple way to remove the substring is given below .

In this method we will use a function called strtok() . It is present in the  <string.h >  library .  This function tokenizes a string i.e. covert a string to series of substring. It splits the char array according to given delimiters.

Syntax- char * strtok(char array[], constant  char *delimiters);

Program to remove a substring from a string :

Let’s see the below program to understand the concept well.

#include <bits/stdc++.h>
using namespace std;
int main()
    // declaration of  string as char. array .
                 char arr[] = "He is a boy and she is a girl"; 
                 string s= "is" ;
                 char *temp = strtok(arr , " "); 
// continue printing tokens while one of the  delimiters is  present in str[]            and selected substring is not equal to the tokens
cout<<  "update sting is :  "  ;
 while (temp != NULL)
          		if(temp!= s )
       		 cout << temp << " ";
          		temp = strtok(NULL, " ");
return 0 ;
Output :
Update sting is : He a boy and she a girl

While the original String was “He is a boy and she is a girl” and after removing a particular substring the updated string is “He a boy and she a girl”.