In all number bases, the radix simply represents the point that separates the integer component from the fractional component in a real number. In decimal notation, the radix is more commonly called a decimal point.
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It is somewhat complicated (search for the IEEE floating-point representation for more details), but the basic idea is that you have a few bits for the base, and a few bits for the exponent. The numbers are stored in binary, not in decimal, so the base and the exponent are the numbers "a" and "b" in a x 2b.
The radix is a property of a numerical system, not an individual number. It is the number of different digits (or characters) used by the system to represent all numbers. Thus the radix of the binary system is 2: 0 and 1 the radix of the octal system is 8: 0,1,2,3,4,5,6 and 7 the radix of the decimal system is 10: 0,1,2,3,4,5,6,7,8 and 9 and so on. Since a number cannot have a radix, the question does not make sense.
The four essential elements of a number in floating-point notation are the sign bit, exponent, mantissa (or significand), and base. The sign bit determines whether the number is positive or negative. The exponent represents the power to which the base is raised. The mantissa holds the significant digits of the number. The base is typically 2 for binary floating-point numbers.
1.000.000 (a million) is the smallest 7-digit number in radix 10 (decimal number). Here are some result of converted value form other bases : * Radix 2 : 26 = 128 * Radix 8 : 86 = 262.144 * Radix 16 : 166 = 16.777.216
It is 2.5611*101