C++ throw exception

#include <stdexcept>

int compare( int a, int b ) {
    if ( a < 0 || b < 0 ) {
        throw std::invalid_argument( "received negative value" );
    }
}

Source: stackoverflow.com

Throw exception c++

#include <stdexcept>
#include <limits>
#include <iostream>

using namespace std;

void MyFunc(int c)
{
    if (c > numeric_limits< char> ::max())
        throw invalid_argument("MyFunc argument too large.");
    //...
}

What is throw in c++

//throw "throws" an exception.
  
It is usually used like:

if(something isnt right){
  throw somethingee;
}

/*(std::)*/cout << somethingee;

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