why I need to use the sizeof () operater , Pls explain the answer with a tiny c++ code

Answer 1

#include <iostream>
using namespace std;

int main() {
string name = "Filip";
int number = 1234;

cout<<sizeof(name)<<endl;
cout<<sizeof(number);

return 0;
}

You use sizeof() to get a number, in the case of 'string' it is the same as an array of chars, first letter is 0, and so on, so the 5 letter word returns 4 in sizeof(name)... And in the case of an integer, well it just counts how many numbers are there in an integer.
That function - sizeof(smth) can be used with arrays, when you need to go through all of the elements, so instead of writing i<5 you write i<sizeof(smth).. Hope you get it

Answer 2

Thank u , i understand it now
though there still a problem and it is that i still don't know why i would need it in a real C++ application?