$ perl -wE 'say hex 0xAf; say hex q{0xAf}; say hex qq{0xAf};'
373
175
175

$ perl -wE 'say sprintf q{%s}, 0xAf; say sprintf q{%s}, q{0xAf}; say sprintf q{%s}, qq{0xAf};'
175
0xAf
0xAf

$ perl -wE 'say hex 175'
373

$ perl -wE 'say oct 0xAf; say oct q{0xAf}; say oct qq{0xAf};'
125
175
175

$ perl -wE 'say oct 175'
125