Have you been frustrated sometimes trying to debug an application and really making it worse, the output of your logs are not as desired. Complete chaos and nonsense.
Some of the concepts here will be familiar in c coding language, as objective c is just an extended c with object oriented approach. Take a quick look at this table that will surely clear things up.
| Type | Constants | NSLog | Short Explanation |
|---|---|---|---|
| char | "a", "\n" | %c | – |
| short int | – | %hi, %hx, %ho | %hi, %hx, %ho |
| unsigned short int | – | %hi, %hx, %ho | %hi, %hx (hex notation), %ho (octa notation) |
| int | 12, -97, 0xFFE0, 0177 | %i, %x, %o | also %d can be used in objective-c |
| unsigned int | 12u, 100U, 0xFFU | %u, %x, %o | as above |
| long int | 12L, -200l, 0xfffL | %lu, %lx, %lo | as above |
| long long int | 0xe5e5e5e5LL, 500LL | %lli, %llx, %llo | as above |
| long long unsigned int | 0xe5e5e5e5ULL, 120ULL | %llu, %llx, %llo | as above |
| float | 12.34f, 3.1e-5f | %f, %e, %g | %f (with 6 decimal place by default), %e (with scientific notation), %g (personal preference most readable) |
| double | 12.34, 3.1e-5 | %f, %e, %g | as above |
| long double | 12.34l, 3.1e-5l | %Lf, %Le, %Lg | as above |
| id | – | %p |