Bug 190341

The Posix printf(3) manual (http://pubs.opengroup.org/onlinepubs/9699919799/functions/fprintf.html) says that there is a difference between the "ll" and "L" prefixes: The former only works for integer types and formats, and the latter only for floating point (long long double).

Our printf(3) manual also starts with explaining exactly the same distinction, but then adds a line which contradicts itself - it says for LL that "This is a synonym for ll.", despite just having explained that there is a difference between them.

In fact, in glibc's printf(), LL and ll indeed seem to be synonyms, and both support either integers and floating point. The sample program:

    long double d = 123.456;
    printf("Lf: %Lf\n", d); 
    printf("llf %llf\n", d); 
    long long int i = 123456;
    printf("Ld: %Ld\n", i); 
    printf("lld: %lld\n", i); 

produces four lines of output:

    Lf: 123.456000
    llf 123.456000
    Ld: 123456
    lld: 123456

So our printf(3) manual should probably not have a separate "ll" and "L" sections - rather it should have a single "ll or L" section, about both integer and floating point types. It might be interesting to mention that for Posix compatibility, L should be used for the floating point types and ll for the integer types.