Is it true that too many recursive calls may result into stack overflow?
Answer: A
Yes, too many recursive calls may result into stack overflow. because when a function is called its return address is stored in stack.
After sometime the stack memory will be filled completely. Hence stack overflow error will occur.
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What is the output of this C code?
int x = 5;
void main()
{
int x = 3;
printf("%d", x);
{
x = 4;
}
printf("%d", x);
}
Answer: D
Correct answer: 3 4
The inner x = 4; is an assignment, not a declaration, so it changes the x already in scope - main's local. The first printf shows 3 and the second, after the block, shows 4. The file-scope x = 5 is shadowed throughout and never seen.
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What is the output of this C code?
void main()
{
m();
m();
}
void m()
{
static int x = 5;
x++;
printf("%d", x);
}
Answer: A
Correct answer: 6 7
A static local is initialised once, before the program starts, and keeps its value between calls - its storage lasts as long as the program even though its name is local. So the first call prints 6 and the second 7. An ordinary local would print 6 both times.
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The output of the code below is
void m(int k)
{
printf("hi");
}
void m(double k)
{
printf("hello");
}
void main()
{
m(3);
}
Answer: C
Correct answer: Compile time error
C has no function overloading: two functions cannot share a name, whatever their parameters. The compiler reports a redefinition. In C++ this would compile, and m(3) would select the int version.
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If no storage class is specified for a local variable, the default is auto.
Answer: A
Correct answer: true
A variable declared inside a block with no storage class is auto - on the stack, uninitialised, and gone when the block ends. The keyword is almost never written, precisely because it is the default.
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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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