Which function definition will run correctly?
Answer: B
Correct answer: int sum(int a, int b) {return (a + b);}
A function definition must have its body in braces. The forms without braces are not definitions at all. (The third also uses the old K&R parameter style but omits the type declarations that style requires.)
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A function may have any number of return statements each returning different values.
Answer: A
Correct answer: True
A function may contain as many return statements as its logic needs - typically one per branch - and each may return a different value. The first one reached ends the function.
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Which of the following is a storage specifier?
Answer: C
Correct answer: auto
The storage class specifiers are auto, register, static, extern and typedef. enum and union introduce types, and volatile is a type qualifier, not a storage class.
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In C, a global variable that is not explicitly initialised is set to ________.
Answer: D
Correct answer: zero
Variables with static storage duration, which includes all globals, are zero-initialised before the program starts. It is local variables of automatic storage duration that hold indeterminate values until assigned.
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The output of the code below is
void main()
{
int k = m();
printf("%d", k);
}
void m()
{
printf("hello");
}
Answer: A
Correct answer: Error
m is defined after main and not declared before it, so at the call the compiler either rejects it outright or, under the old rules, assumes int m() - and the later definition as void m() then conflicts with that assumption. Either way the program does not compile. Assigning the result of a void function to an int would be an error in its own right.
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Usually recursion works slower than loops.
Answer: A
When a recursive call is made, the function/process clones itself and then process that funtion. This leads to time and space constrains.
In a loop, there is no recursive call involved that saves a lot of time and space too.
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What is the output of this C code?
void main()
{
m();
printf("%d", x);
}
int x;
void m()
{
x = 4;
}
Answer: B
Correct answer: Compile time error
x is declared after main, so it is not in scope where main uses it, and m is neither declared nor defined before its call. The compiler rejects the program on both counts.
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What is the output of this C code?
void main()
{
int x;
}
here x is a
Answer: A
Correct answer: automatic variable
x is declared inside a function with no storage class, so it is automatic by default - on the stack, uninitialised, and gone when main returns.
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If a function contains two return statements successively, the compiler will generate warnings. Yes/No ?
Answer: A
Correct answer: Yes
Two return statements one after the other make the second unreachable: the first ends the function. Compilers warn about unreachable code because it almost always means the author intended something else.
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Automatic variables are stored in:
Answer: A
Correct answer: stack
Automatic variables are allocated on the stack: space is reserved when the block is entered and released when it is left, which is what makes their lifetime match the block and what makes recursion possible - each call gets its own frame.
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