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Topic: Add 32-bit Numbers (Read 1274 times) |
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william wu
wu::riddles Administrator
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Add 32-bit Numbers
« on: Feb 4th, 2003, 9:37pm » |
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From Usenet:
You have to add three 32-bit two's complement numbers using only one '+'. Other legal (C) operators are ! ~ &
^ | << >> but those can be used more than once. You may at most use 17 operators.
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Jeremiah Smith
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Beep!
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Re: Add 32-bit Numbers
« Reply #1 on: Feb 8th, 2003, 4:15pm » |
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Are parentheses considered operators for this problem?
I can already see that I can't make any temporary variables, since = (assignment) is an operator itself and isn't on the list...
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Grimbal
wu::riddles Moderator
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Re: Add 32-bit Numbers
« Reply #2 on: May 29th, 2004, 3:29pm » |
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int add3(int a, int b, int c){
return (a^b^c) + ((a&(b|c)|b&c)<<1);
}
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