Integer Types and Literals

On x86-64 Consider the above, and there there are signed and unsigned versions of them.

• Signed = no negative. Adds 1 more bit (i.e 2x more numbers) char is a number type! (by default it is signed)

size_t

%zu is to print vars ofsize_t which is technically different from any other number. sizeof() returns results in bytes (not bits)

Integer literal notation

sizeof('c') == sizeof(int) since character literals are integers. Also sizeof(3U) == sizeof(unsigned int)

int number = 3;
int char = 'c'; // char literal
unsigned int u_int = 6U; // Int doesn't have a letter
unsigned long long ull_int = 13ULL // but longs do (L)

Places of contention:

• printf("lu\n", 3) would print gibberish since 3 is an integer, not an unsigned long.
• printf("lu\n", 3UL) would print correctly since we’re passing an unsigned long