declaring the size of int, double, floats

[persianmess]

#include <iostream>
using namespace std;
int main()
{
int i;
float x, y, z;
double d;

i = 15;
d = 40;
x = 25;
y = 125;
z = y/x;

return 0;
}





Question to all .. I need to declare the size of my int, float(s), and the double listed above. How would I got about doing so?

For instance, my string: string str ("str");
I did it like: cout << "The size of my str is: " << str.size() << " characters." << endl;

Please help!

[Peter87]

If you are talking about the size in bytes you can use sizeof. This is very different from what you get from the size() member function.

[vlad from moscow]

There is no such a standard fucntion that would report the number of decimal digits. You can write it yourself.:)

For example if you are using MS VC++ 2010 you can write

double f = 6.25;

std::string s = std::to_string( ( long double )f );
std::cout << "s = " << s << ", size = " << s.size() << std::endl;

The result is

s = 6.25, size = 4