1. Limits
  2. Native Types
    1. char
    2. double
  3. NSLog Formats

Limits

System limits for various types can be found in limit.h.

  @import <limits.h>
  // ...
  NSLog(@"CHAR_MIN:   %c",   CHAR_MIN);
  NSLog(@"CHAR_MAX:   %c",   CHAR_MAX);
  NSLog(@"SHRT_MIN:   %hi",  SHRT_MIN);    // signed short int
  NSLog(@"SHRT_MAX:   %hi",  SHRT_MAX);
  NSLog(@"INT_MIN:    %i",   INT_MIN);
  NSLog(@"INT_MAX:    %i",   INT_MAX);
  NSLog(@"LONG_MIN:   %li",  LONG_MIN);    // signed long int
  NSLog(@"LONG_MAX:   %li",  LONG_MAX);
  NSLog(@"ULONG_MIN not defined, it's always zero: %lu", 0);  
  NSLog(@"ULONG_MAX:  %lu",  ULONG_MAX);   // unsigned long int
  NSLog(@"LLONG_MIN:  %lli", LLONG_MIN);   // signed long long int
  NSLog(@"LLONG_MAX:  %lli", LLONG_MAX);
  NSLog(@"ULLONG_MIN not defined, it's always zero: %llu", 0);  
  NSLog(@"ULLONG_MAX: %llu", ULLONG_MAX);  // unsigned long long int

Native Types

char

  'a', '\n'

double

double is guaranteed to be at least 64-bit. All numeric constants are by default assumed to be a double unless
specified with either am f or F.

  12.31  // minimum 64-bit double 
  12.31f // minimum 32-bit float
  12.31F // minimum 32-bit float

NSLog Formats

Type Constant Examples NSLog Format
char ‘a’, ‘\n’ %c
short int %hi, %hx, %ho
unsigned short int %hu, %hx, %ho
int 17, -99, 0xFFAE, 0878 %i, %x, %o
unsigned int 17u, 101U, OXFFu %u, %x, %o
long int 17L, -2998, OxffffL %li, %lx, %lo
unsigned long int 17UL, -100ul, OxffeeUL %li, %lx, %lo
long long int 0xe5e5e5e5LL, 500ll %lli, %llx, %llo
unsigned long long int 17ull, oxffefULL %llu, %llx, %llo
float 12.3f, 3.1e-5f, 0×1.5p10, 0×1P-1 %f, %e, %g, %a
double 12.34, 3.1e-5, 0×.1p3 %f, %e, %g, %a
long double 12.34l, 3.1e-5l %Lf, %Le, %Lg
id nil %p