how to change certain number from set c++

To change a certain number from a set in C++, you can follow these steps:

1. Declare a set variable and initialize it with the desired numbers.
2. Use the find() function to search for the specific number you want to change in the set.
3. If the number is found, erase it using the erase() function.
4. Insert the new number into the set using the insert() function.

Here's an example code snippet that demonstrates these steps:

#include <iostream>
#include <set>

int main() {
    std::set<int> numbers = {1, 2, 3, 4, 5};
    int oldNumber = 3;
    int newNumber = 10;

    // Step 1: Declare and initialize the set

    // Step 2: Search for the specific number
    auto it = numbers.find(oldNumber);

    // Step 3: If the number is found, erase it
    if (it != numbers.end()) {
        numbers.erase(it);

        // Step 4: Insert the new number
        numbers.insert(newNumber);
    }

    // Print the updated set
    for (const auto& num : numbers) {
        std::cout << num << " ";
    }
    std::cout << std::endl;

    return 0;
}

In this example, we have a set of numbers {1, 2, 3, 4, 5}. We want to change the number 3 to 10.

The find() function is used to search for the number 3 in the set. If it is found (it != numbers.end()), the erase() function is used to remove it from the set. Then, the insert() function is used to insert the new number 10 into the set.

Finally, the updated set is printed using a loop. The output will be: 1 2 4 5 10.