Free Test Input/output using cin... – C++ Lan...

Q1: Which header file is required to use cin and cout?

A. <iostream> B. <stdio.h> C. <conio.h> D. <fstream>

Q2: What operator is used with cout to display output?

A. << B. >> C. == D. =

Q3: What operator is used with cin to take input?

A. >> B. << C. = D. ==

Q4: How do you print a new line using cout?

A. cout << endl; B. cout << \n; C. cout << "\n"; D. All of the above

Q5: What is the purpose of using "using namespace std;"?

A. To avoid prefixing std:: before cout and cin B. To import all libraries C. To create a namespace D. To end the program

Q6: Which of the following statements correctly takes an integer input?

A. int x; cin >> x; B. int x; cout >> x; C. int x; cin << x; D. int x; cout << x;

Q7: What will be the output of: cout << 5 + 7 << endl;

A. 12 B. 5 + 7 C. Error D. None

Q8: How can you prompt the user before taking input?

A. cout << "Enter a number: "; cin >> num; B. cin << "Enter a number: "; C. printf("Enter a number: "); D. input("Enter a number: ");

Q9: Which of the following is NOT a valid output statement?

A. cout >> "Hello"; B. cout << "Hello"; C. cout << 100; D. cout << endl;

Q10: How to read multiple inputs in a single statement?

A. cin >> x >> y; B. cin << x << y; C. cout >> x >> y; D. cin >> (x, y);

Q11: What does endl do in cout << endl;

A. Moves cursor to the next line and flushes the output buffer B. Only moves cursor to next line C. Only flushes the buffer D. Clears the screen

Q12: How to output text and variables together?

A. cout << "Age: " << age; B. cout << "Age: " + age; C. cout >> "Age: " >> age; D. cout << "Age: " && age;

Q13: Which of these is the correct way to output a float variable?

A. cout << f; B. cout >> f; C. print(f); D. printf("%f", f);

Q14: What happens if you forget to include <iostream> but use cout?

A. Compilation error B. Runs fine C. Runtime error D. Warning only

Q15: What is the correct way to output a double value?

A. cout << d; B. cout >> d; C. print(d); D. printf("%lf", d);

Q16: How do you output a literal string?

A. cout << "Hello"; B. cout >> "Hello"; C. printf("Hello"); D. print("Hello");

Q17: Which object is used to read a single character?

A. char ch; cin >> ch; B. int ch; cout >> ch; C. char ch; cout << ch; D. int ch; cin << ch;

Q18: What does the following code do: cin.ignore();?

A. Ignores the next character in the input buffer B. Clears the input buffer C. Stops input D. Prints a blank line

Q19: How to flush the output buffer without adding newline?

A. cout.flush(); B. cout << endl; C. cout.flush << endl; D. flush(cout);

Q20: Which statement correctly outputs the value of variable x and a newline?

A. cout << x << endl; B. cout >> x >> endl; C. printf("%d\n", x); D. print(x);

Quiz for Input/output using cin, cout