1. which of the following can be passed in function pointers?
a) variables
b) data types
c) functions
d) objects
Discussion
Explanation: Only functions are passed in function pointers.
2. What is the meaning of the following declaration?
int(*ptr[5])();
a) ptr is pointer to function
b) ptr is array of pointer to function
c) ptr is pointer to such function which return type is array
d) ptr is pointer to array of function
Discussion
Explanation: In this expression, ptr is array not pointer.
3. which keyword is used to define the macros in c++?
a) macro
b) define
c) #define
d) #macro
Discussion
Explanation: #define is the keyword which is used to define the macros in c++.
4. Which symbol is used to declare the preprocessor directives?
a) #
b) $
c) *
d) ^
Discussion
Explanation: # symbol is used to declare the preprocessor directives.
5. How many types of macros are there in c++?
a) 1
b) 2
c) 3
d) 4
Discussion
Explanation: There are two types of macros. They are object-like and function-like.
6. What is the mandatory preprocessor directive for c++?
a) #define <iostream>
b) #include <iostream>
c) #undef <iostream>
d) #macro <iostream>
Discussion
Explanation: For a c++ program to execute, we need #include
7. What will be the output of the following C++ code?
#include <iostream>
using namespace std;
#define SquareOf(x) x * x
int main()
{
int x;
cout << SquareOf(x + 4);
return 0;
}
a) 16
b) 64
c) compile time error
d) 75386824
Discussion
Explanation: In this program, as we have not initialize the variable x, we will get a output of ending digit of 4.
Output:
75386824
8. What will be the output of the following C++ code?
#include <iostream>
using namespace std;
#define PR(id) cout << "The value of " #id " is "<< id
int main()
{
int i = 10;
PR(i);
return 0;
}
a) 10
b) 15
c) 20
d) 12
Discussion
Explanation: In this program, we are just printing the declared values.
Output:
10
9. What will be the output of the following C++ code?
#include <iostream>
using namespace std;
#define MAX 10
int main()
{
int num;
num = ++MAX;
cout << num;
return 0;
}
a) 10
b) 11
c) compile time error
d) 13
Discussion
Explanation: Macro Preprocessor only replaces occurance of macro symbol with macro symbol value, So we can’t increment the value.
10. What is the other name of the macro?
a) scripted directive
b) executed directive
c) link directive
d) executed & link directive
Discussion
Explanation: When the compiler encounters a previously defined macro, it will take the result from that execution itself.