Question

How do I get 64-bit integers in C?

Answer 1

@Computer Science

Answer 2

long long int

Answer 3

I tried and it said 'long long long too long for gcc'

Answer 4

oh just 2 longs :-P

Answer 5

and a single long is guaranteed 32 bit int right?

Answer 6

yes

Answer 7

and if I just type in 'int' it depends on the target machine right?

Answer 8

what about all the int64_t types defined in <stdint.h>

Answer 9

int , long and long int would declare 32 bit integer

Answer 10

/* 7.18.1.1 Exact-width integer types */
typedef signed char int8_t;
typedef unsigned char uint8_t;
typedef short int16_t;
typedef unsigned short uint16_t;
typedef int int32_t;
typedef unsigned uint32_t;
typedef long long int64_t;
typedef unsigned long long uint64_t;

/* 7.18.1.2 Minimum-width integer types */
typedef signed char int_least8_t;
typedef unsigned char uint_least8_t;
typedef short int_least16_t;
typedef unsigned short uint_least16_t;
typedef int int_least32_t;
typedef unsigned uint_least32_t;
typedef long long int_least64_t;
typedef unsigned long long uint_least64_t;

/* 7.18.1.3 Fastest minimum-width integer types
* Not actually guaranteed to be fastest for all purposes
* Here we use the exact-width types for 8 and 16-bit ints.
*/
typedef signed char int_fast8_t;
typedef unsigned char uint_fast8_t;
typedef short int_fast16_t;
typedef unsigned short uint_fast16_t;
typedef int int_fast32_t;
typedef unsigned int uint_fast32_t;
typedef long long int_fast64_t;
typedef unsigned long long uint_fast64_t;

Answer 11

so that file is bogus it just renames my types?

Answer 12

ah it's C99 :-P

Answer 13

dude .. you give me headache :P

Answer 14

why don't you just relax and learn one thing at a time ? :P

Answer 15

but I don't learn so well the bottom_up way :(