This is the c++ programming questions and answers section on "constants" with explanation for various interview, competitive examination and entrance test. Solved examples with detailed answer description, explanation are given and it would be easy to understand.
1. The constants are also called as
- A. const
- B. preprocessor
- C. literals
- D. none of the mentioned
Answer: Option C
Explanation:
literals
2. What are the parts of the literal constants?
- A. integer numerals
- B. floating-point numerals
- C. strings and boolean values
- D. all of the mentioned
Answer: Option D
Explanation:
Because these are the types used to declare variables and so these can be declared as constants.
3. How the constants are declared?
- A. const keyword
- B. #define preprocessor
- C. both a and b
- D. None of the mentioned
Answer: Option C
Explanation:
The const will declare with a specific type values and #define is used to declare user definied constants.
4. What is the output of this program?
#include
using namespace std;
int main()
{
int const p = 5;
cout << ++p;
return 0;
}
- A. 5
- B. 6
- C. Error
- D. None of the mentioned
Answer: Option C
Explanation:
We cannot modify a constant integer value.
5. What is the output of this program?
#include < iostream >
using namespace std;
#define PI 3.14159
int main ()
{
float r = 2;
float circle;
circle = 2 * PI * r;
cout << circle;
return 0;
}
- A. 12.566
- B. 13.566
- C. 10
- D. compile time error
Answer: Option A
Explanation:
In this program, we are finding the area of the circle by using concern formula.
