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Strings - Programming

Q1:

If s1 and s2 are references to two strings then which of the following are the correct ways to find whether the contents of the two strings are equal? 
  1. if(s1 = s2)
  2. if(s1 == s2)
  3. int c;
c = s1.CompareTo(s2);
  4. if( strcmp(s1, s2) )
  5. if (s1 is s2)

A 1, 2

B 2, 3

C 4, 5

D 3, 5

ANS:A - 1, 2

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