type  sign  exponent  significand  total bits  exponent bias  bits precision number of decimal digits
0    half ( ieee 754 - 2008 )     1         5           10          16             15              11                     ~3.3
1                      single     1         8           23          32            127              24                     ~7.2
2                      double     1        11           52          64           1023              53                    ~15.9
3  double extended (80 - bit)     1        15           64          80          16383              64                    ~19.2
4                        quad     1        15          112         128          16383             113                    ~34.0

Table as JSON:
{"type":{"0":"half ( ieee 754 - 2008 )","1":"single","2":"double","3":"double extended (80 - bit)","4":"quad"},"sign":{"0":1,"1":1,"2":1,"3":1,"4":1},"exponent":{"0":5,"1":8,"2":11,"3":15,"4":15},"significand":{"0":10,"1":23,"2":52,"3":64,"4":112},"total bits":{"0":16,"1":32,"2":64,"3":80,"4":128},"exponent bias":{"0":15,"1":127,"2":1023,"3":16383,"4":16383},"bits precision":{"0":11,"1":24,"2":53,"3":64,"4":113},"number of decimal digits":{"0":"~3.3","1":"~7.2","2":"~15.9","3":"~19.2","4":"~34.0"}}