main()
{
float arr[]{ 0.1f, 0.2f, 3.0f };
printf("%i", (int)&arr[2] - (int)&arr[0]);
return 0;
}

$ g++ L6_6.cpp -o L6_6
L6_6.cpp: In function ‘int main()’:
L6_6.cpp:6:15: error: cast from ‘float*’ to ‘int’ loses precision [-fpermissive]
6 | printf("%i", (int)&arr[2] - (int)&arr[0]);
| ^~~~~~~~~~~~
L6_6.cpp:6:30: error: cast from ‘float*’ to ‘int’ loses precision [-fpermissive]
6 | printf("%i", (int)&arr[2] - (int)&arr[0]);
| ^~~~~~~~~~~~

#include "stdio.h"

main()
{
float arr[]{ 0.1f, 0.2f, 3.0f };
printf((char*)(&arr[2]) - (char*)(&arr[0]));
}

$ g++ tst61.cpp -o tst61
tst61.cpp: In function ‘int main()’:
tst61.cpp:6:25: error: invalid conversion from ‘long int’ to ‘const char*’ [-fpermissive]
6 | printf((char*)(&arr[2]) - (char*)(&arr[0]));
| ~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~
| |
| long int
In file included from tst61.cpp:1:
/usr/include/stdio.h:200:13: note: initializing argument 1 of ‘int printf(const char*, ...)’
200 | int printf (const char *__restrict, ...)
| ^~~~~~~~~~~~