HCL Papers: Sample Questions 12  14 of 57
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Question number: 12
» Aptitude
Write in Short
Find the number which when multiplied with one less than it results into a number that is 4 lesser than its square.
Explanation
 Let the required number be x.
 When x is multiplied with one less than it, results into a number that is 4 lesser than its square.
 Converting this statement into equation form,
 The required number is 4.
Question number: 13
» Aptitude
Write in Short
Average age of A and B is 18, while average age of A, B and C is 22. What is the present age of C?
Explanation
 Average age of A and B is 18.
 Total age of A and B is 36 years.
 Average age of A, B and C is 22.
 Substituting the value of A + B in A + B + C,
 Present age of C is 30 years.
Question number: 14
Question
The type of the controlling expression of a switch statement cannot be of the type
Choices
Choice (4)  Response  

a.  float 

b.  int 

c.  char 

d.  short 

Answer
a.Explanation
The expression used in switch statement must have an integral data type or enumerated data type. It can be arithmetic expression also, where addition or subtraction should result into a constant expression. It can be even a character or a string. But we cannot pass any float, Boolean or double values as expression in switch statement, because performing exact equality matches on float/double is very complex in nature.