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The f specification is for floating-point numbers.
Note that xs are included in the printf statement to clarify
the placement of padding characters.
Display float or double:
printf ("x
--- Result ---
x 3.141590 x
x -3.141590 x
Display with two digits following the decimal point:
printf ("x
--- Result ---
x 3.14 x
x -3.14 x
Display with spaces, if necessary, to fill a six-character field:
printf ("x
--- Result ---
x 3.14 x
x -3.14 x
Display with spaces, if necessary, to fill a six-character field; if more than six characters are involved, display them all anyway:
printf ("x
--- Result ---
x 3.141590 x
x -3.141590 x
Display with spaces, on the right, if necessary:
printf ("x
--- Result ---
x 3.14 x
x -3.14 x
Always include sign:
printf ("x
--- Result ---
x +3.14 x
x -3.14 x
Always include sign and pad on the right:
printf ("x
--- Result ---
x +3.14 x
x -3.14 x