Download Data Structure in C++ (CS 211) and more Slides Data Structures and Algorithms in PDF only on Docsity!
CS 211 Data Structures using C++
- What will be the output of the below program? class Num{ int a; }; void main() { Num n; cout << n.a; } a. Compile error b. n.a c. n d. Garbage value
- Create a class named ‘Employee’ with an integer variable ‘Employee_ID’ and a string variable ‘Employee_name’. Create an object of the class employee and assign values to Employee_ID and Employee_name.
- Which of the following is used to define the class member externally? a. : b. ; c. # d. ::
CS 211
- What is the value of the test(12,13)? int test(int a, int b) { if (a == 0) return 0; return test(a+test(a,b-1)); } a. 1 b. 26 c. 0 d. 156
- What will be the output of the following program? #include using namespace std; int main() { int a = 32, *ptr = &a; char ch = 'P', &cho = ch; cho += a; *ptr += ch; cout << a << ", " << ch << endl; return 0; } a. 32, P b. 32, p c. 144, p d. 144, P
CS 211 Solutions
1. What will be the output of the below program? class Num{ int a; }; void main() { Num n; cout << n.a; } a) Compile error b) n.a c) n d) Garbage value Answer: a Since the default access is private in c++, a is a private member of Num and so it causes a compiler error to access it outside the class. 2. Create a class named ‘Employee’ with an integer variable ‘Employee_ID’ and a string variable ‘Employee_name’. Create an object of the class employee and assign values to Employee_ID and Employee_name. Answer: class Employee { public: int Employee_ID; string Employe_name; }; int main()
CS 211
Employee e; e.Employee_ID=43; e.Employee_name=”Jey”; cout<< e.Employee_ID << e.Employee_name<<endl; return 0; }
3. Which of the following is used to define the class member externally? a. : b. ; c. # d. :: Answer: d :: is used to define members of the class globally. 4. What is the value of the test(12,13)? int test(int a, int b) { if (a == 0) return 0; return test(a+test(a,b-1)); } a. 1 b. 26 c. 0 d. 156 Answer: d It’s recursive multiplication and test(a+test(a,b-1)) iteratively calculates b times sum of a.
CS 211
6. What will be the output of the following program? #include using namespace std; int main() { const int i = 15; const int* const ptr = &i; (ptr)++; int j = 20; ptr = &j; cout << i; return 0; } a. 20 b. 21 c. 15 d. Compile error Answer: d. Compile error Explanation: Here “ptr” has been defined as a constant pointer that holds the address of a constant integer “i”. So, neither can the value of “ptr” be changed, nor can the value held by it can be changed. Thus the lines “(ptr)++” and “ptr=&j” are invalid, as they are trying to modify the variable i’s content and the value of the pointer respectively. This gives an error.
