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The maximum value represented in a 32-bit unsigned word is 232-1 = 4,294,967,295, so you can represent all numbers with 9 decimal places and some numbers with 10 decimal places in 32-bits. log(232-1) = 9.632959861 is the true answer.
The previous number!
111100002 equals 24010 using unsigned notation. It equals -1610 using signed notation.
127 -128
The number 1231 as a decimal is simply 1231. This is because whole numbers are already in decimal form, with no fractional or decimal parts. Decimals are a way to represent numbers that are not whole, such as fractions or numbers with decimal points. In this case, 1231 is a whole number and is already in decimal form.