C++ - REMOVE FROM SET

How to remove an element from the set by its name/value?

Let us say, we have a set that contains three names, Mohan, Kriti and Salim. And we want to remove Kriti from the set.

It can be done with the erase() Method

Example :

#include <iostream>
#include <set>

using namespace std;


int main() {
        
    set<string> x; 
        
    x.insert("Mohan");
    x.insert("Kriti");
    x.insert("Salim");
    
    x.erase("Kriti");
        
    for (string data : x)  
    {  
        cout << data << endl;  
    }
        
    return 0;    
}

Output :

Mohan
Salim

So, in the above code we have created a set and initialised to the variable x.

set<string> x;

x.insert("Mohan");
x.insert("Kriti");
x.insert("Salim");

Below is how the values are positioned in the set(i.e. In sorted order),

Next, we have used the erase() function that searches for the name Kriti and removes it from the set.

x.erase("Kriti");

And we get the below output,

Output :

Mohan
Salim

How to remove all the elements from the set?

The Clear() Method can be used to remove all the elements from the set.

Example :

#include <iostream>
#include <set>

using namespace std;


int main() {
        
    set<string> x; 
        
    x.insert("Mohan");
    x.insert("Kriti");
    x.insert("Salim");
    
    x.clear();
        
    for (string data : x)  
    {  
        cout << data << endl;  
    }
        
    return 0;    
}

Output :

So, in the above code we have created a set and initialised to the variable x.

set<string> x;
x.insert("Mohan");
x.insert("Kriti");
x.insert("Salim");

Below is how the values are positioned in the set,

Next, we have used the clear() function that removes all the elements from the set making the set empty.

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