FLOATING-POINT NUMBERS | B FLOATING-POINT NUMBERS 1 1 Negative overflow 3 Negative underflow 5 Positive underflow 2 4 6 Expressible Zero Expressible negative numbers positive numbers 7 Positive overflow .10100 1Q 1 0 10 100 10100 Figure B-1. The real number line can be divided into seven regions. Digits in fraction Digits in exponent Lower bound Upper bound 3 1 10-12 109 3 2 10-102 1099 3 3 10-1002 10999 3 4 10-10002 109999 4 1 10-13 109 4 2 10-103 1099 4 3 10-1003 10999 4 4 10-10003 109999 5 1 10-14 109 5 2 10-104 1099 5 3 10-1004 10999 5 4 10-10004 109999 10 3 10-1009 10999 20 3 10-1019 10999 Figure B-2. The approximate lower and upper bounds of expressible unnormalized floating-point decimal .
