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# Binary number arithmetic question... quiz question I got wrong but can't figure out the right answers to.?

Use seven bits to accommodate each number together with its sign. In each case, determine if there's an overflow.

A. (+35) + (+40)

B. (-35) + (-40)

C. (-35) - (+40)

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- gitter1226Lv 51 decade agoFavorite Answer
For A...

Convert 35 and 40 to binary using 7 digits. First, I have to assume that these numbers are using two's complement, since B & C use negative numbers.

0100011

+0101000

________

1101011

1101011 converts to a negative number in two's complement which is not valid. the easier way to remember is that signed two's bit complement numbers can only represent numbers -64 <= x <= 63

Since 35 + 40 = 70 which is greater than 63, you know there will be overflow.

B & C follow directly.

Source(s): Software Architect.

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