IBM Interview Question: swap two numbers without usin... | Glassdoor

Interview Question

Technical Consultant Interview

swap two numbers without using temporary variable

Answer

Interview Answer

2 Answers

0

b=a+b;
a=b-a;
b=b-a;

sagar on May 15, 2011
0

Sagar's answer is decent, but there might be problems if they consider overflow. Better is using xor:

b = a XOR b
a = a XOR b
b = a XOR b

David on May 30, 2011

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