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  1. #include <iostream>
  2. using namespace std;
  4. int main() {
  5.    cout << "Size of char : " << sizeof(char) << endl;
  6.    cout << "Size of int : " << sizeof(int) << endl;
  7.    cout << "Size of short int : " << sizeof(short int) << endl;
  8.    cout << "Size of long int : " << sizeof(long int) << endl;
  9.    cout << "Size of float : " << sizeof(float) << endl;
  10.    cout << "Size of double : " << sizeof(double) << endl;
  11.    cout << "Size of wchar_t : " << sizeof(wchar_t) << endl;
  13.    return 0;
  14. }
  16. /*
  17. Size of char : 1
  18. Size of int : 4
  19. Size of short int : 2
  20. Size of long int : 4
  21. Size of float : 4
  22. Size of double : 8
  23. Size of wchar_t : 4
  24. */

Reference

https://www.tutorialspoint.com/cplusplus/cpp_data_types.htm