dump sizes of atomic numeric types in c/c++

sizes.cpp

#include <iostream>

using namespace std;

#define showsize(tname) cout << #tname << ": " << sizeof(tname) << endl

int main(int argv, char** argc) {
    showsize(char);
    showsize(short);
    showsize(int);
    showsize(long);
    showsize(long long);
    showsize(float);
    showsize(double);
    showsize(long double);
}