What are the format specifiers I can use?

Question

I'm using code::blocks with windows to program in c. Lately, I've hit a few problems trying to find out the addresses and values stored in the addresses of floats, long longs, etc. I've figured out that I need to use "I64d" instead of "lld". Is there a list of the format specifiers that I must use instead of the "normal" ones (eg "d", "ld", "lld", etc)? Thanks.

Answer 1

All the format specifiers are shown in the standard. The current C11 standard shows the "normal ones" in 7.20.6.1 The fprintf function .

However, there are also the "extra" integer types (such as uint16_t ) defined in stdint.h . The corresponding fprintf macros to use as format specifiers for those types are included in inttypes.h and detailed in the standard, 7.8.1 Macros for format specifiers .

An example would be:

int16_t val = 42;
printf ("val = %2" PRId16 "\n", val);

Keep in mind that there are also equivalents for the fscanf side of things as well, with the macros starting with SCN instead of PRI .