#include <> not needed in cpp.sh?

[FireCoder]

Hello!
I have a somewhat simple problem. In cpp.sh you only thing you need is...

#include <iostream> 

For example...

#include <iostream>
//should need <ctime>
//should need <cstdlib>
//should need <string>

int main()
{
    std::string inPutNum; //Users inputed number.
    int outPutNum; //Users outputed number.
    const int MAX_RAND_VALUE = 100; //Maximum randum number limit.
    
    srand(time(NULL)); //unique seed.
    
    std::cout << "I will give you a unique number based off of your"
              << " input of a integer (whole number).\n";
    
    std::cout << "Number: "; //"Asks" for a intager.
    getline(std::cin,inPutNum); // Grabs the number.
    
    outPutNum = stoi(inPutNum); //sets are int to the users input.
    
    if(outPutNum < 1 || outPutNum > 9999) //Keeps a resonable number.
    {
        outPutNum = 1;
    }             
    
    std::cout << outPutNum << " is the number we were able to use.\n" ;
    std::cout << "\n\nRandom Ultra Number (R.U.N): " << (outPutNum * outPutNum)
                 * (((rand() % MAX_RAND_VALUE) + 1) + outPutNum); //*facepalm*
                 
    //notice no return statment!
}

any idea?

P.S My original code! Is it any good?

[helios]

A particular implementation may #include other headers from a header, so when you #include <iostream>, you might also end up #including <ctime> indirectly. However, your code might not compile in other implementations.

[FireCoder]

Thanks, I just was curios.