$ make gcc main.c -o type_sizes $ file type_sizes type_sizes: Mach-O 64-bit executable x86_64 $ ./type_sizes size of char: 1 size of int: 4 size of long int: 8 size of float: 4 size of double: 8 size of struct with one element: char: 1 size of struct with two elements: char + int: 8 size of pointer to char: 8 size of pointer to int: 8 size of pointer to float: 8 size of pointer to double: 8 size of pointer of struct with one element: char: 8 size of pointer of struct with two elements char + int: 8