Deutsche Bank Interview Question
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Interview Question for Team Lead Engineering at Deutsche Bank:
Nov 20, 2009
Is it possible to swap two registers without using a third one?
| Tags: | logic, analytical, algorithm, math See more , See less 8 |
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Nov 14, 2010
When we talk of registers XORing is the operation that we can perform.
Say a = 5 ; b = 10
a = a XOR b; // 5 XOR 10 is 15 so "a = 15"
b = a XOR b // 15 XOR 10 is 5 so "b = 5"
a = a XOR b // 15 XOR 5 is 10 so "a = 10"
So in the end a = 10 and b = 5
Say a = 5 ; b = 10
a = a XOR b; // 5 XOR 10 is 15 so "a = 15"
b = a XOR b // 15 XOR 10 is 5 so "b = 5"
a = a XOR b // 15 XOR 5 is 10 so "a = 10"
So in the end a = 10 and b = 5
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by Interview Candidate:
int a=5,b=10;a=a+b; b=a-b; a=a-b;