Quiz: Control Structures

Take this quiz to test your understanding of the different combinations of control structures.

We'll cover the following

We have covered the selection control structures (if, if-else, and switch) and repetition or iteration control structures (while, for, and do-while).

Let’s solve some quiz questions below to revise the working of different combinations of nested control structures. In the quiz, we may have multiple correct options. So let’s start!

Question: if, switch, and for

Refer to the following code snippet to answer the quiz questions below.

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int marks, noOfCourses = 3;
for(int i=1; i<=noOfCourses; i++)
{
  cout << "Your marks " << endl; 
  cin >> marks; // where user inputs any number
  
  if(marks >= 0 && marks <= 100)
  {
    switch((marks-1)/10)
    {
      case 9: 
        cout << "A" << endl;
        break;
      case 8: 
        cout << "A-" << endl;
        break;
      case 7: 
        cout << "B" << endl;
        break;
      case 6: 
        cout << "B-" << endl;
        break;
      case 5: 
        cout << "C" << endl;
        break;
      case 4:
      case 3:
      case 2:
      case 1:
      case 0: 
        cout << "F" << endl;
        break;
    }
  }    
  else
  {
    cout << "Invalid input";
    i--;   
  }
}
1

For marks = 90, what grade would be displayed?

A)

A

B)

A-

Question 1 of 40 attempted

Question: for and while

Refer to the following code snippet to answer the quiz questions below.

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  int sum = 0, size = 5, even;
  for(int i=1; i<size; i++) 
  {
    cin >> even;
    while(even % 2 != 0)
    { 
      cin >> even;
    }
    sum += even;
  }
  cout << sum;
1

What will be the output of the above code if we enter -5, 7, 2, and 10 as inputs?

A)

No output

B)

14

Question 1 of 20 attempted

Question: if and do-while

Refer to the following code snippet to answer the quiz questions below.

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int num, evenCount = 0;
cin >> num;
do 
{
  if(num % 2 == 0) 
    evenCount++;
  cin >> num;
}  
while(num != -1);
cout << evenCount << endl;
1

What will be the output of the following code if we enter -5, 1, 12, and 10 as inputs?

A)

No output

B)

18

C)

2

Question 1 of 40 attempted

Question: for, if and, if-else

Refer to the following code snippet to answer the quiz questions below.

Variant 1 

int max, 
    value;

for(int i=1;  i<=5; i++)
{
 cin >> value;
 if(i==1)
     max = value; 
 else if(value > max)
     max = value;
}
cout << max;

Variant 2 

int max, value;

cin >> value;
max=value;

for(int i=2; i<=5; i++)
{
 cin >> value;
 if(value > max)
    max = value;
}
cout << max;
Q

Which of the code variants is more efficient?

A)

Variant 1

B)

Variant 2

Coding playground

If you chose a wrong answer to any of the questions above, use the editor below to run that question’s code and observe its output.

#include<iostream>
using namespace std;

int main()
{
  // Test your code here.

 return 0;
}
Code editor to test your code