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NIELIT 2016 MAR Scientist B - Section C: 13

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What error would the following function give on compilation? 

f(int a, int b) 
{ 
int a; 
a=20; 
return a; 
}
  1. Missing parenthesis is $\textit{return}$ statement.
  2. Function should be defined as $\text{int f(int a, int b)}$
  3. Redeclaration of $a$.
  4. None of these.
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6 Answers

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A) Missing parenthesis in return statement.-> This is wrong because return statement does not require parenthesis.

B) Function should be defined as int f(int a, int b) -> When a function is not defines with any data type in C, it automatically assumes it to return an integer. The same would not be true if the return value would be float or any other data type. So this option is wrong.

C) Redeclaration of variable a. -> This is the correct option because int a is already declared in the argument of the function and inside the function body 'a' is declared once again which will cause error.
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Correct answer is C: Redeclaration of variable "a",which is not allowed and this is the expected error
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The answer would be 'Redeclaration of a' as a is already a parameter here.

'Function should be defined as int f(int a, int b)' won't be a compilation error, it would give unexpected results in the output.
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