CBSE Class 11 Computer Science Control Flow Part II Assignment

Marks Questions

Question: What is the general-syntax of ‘do while’ loop?
Answer: do statement while(expression);

Question: What is ‘do while’ loop called?
Answer: Post Test Loop

Question: What is ‘while’ loop called?
Answer: Pre-Test Loop

Question: What are the minimum no of repetition’s for a ‘while’ loop?
Answer: May not even once or zero times

Question: What are the minimum no of repetition’s for a ‘do while’ loop?
Answer: At least one time

Questions from Exercise

Question: What are the three different types of expressions in for loop?
Answer: Three types of expressions are used in the for loop which are shown below:
Syntax: for(expression1; expression2;expression3) Example: for(i=1 ; i<=5 ; i++)
{ {
} }
Expression1: It is called initialization Part. It is used to initialize the loop counter variable. For example: i=1;
Expression2: It is called the test-condition Part. It is used to test the condition for the loop. For example: i<=5;
Expression3: It is called Iteration Part. It is used to increment /decrement the loop counter value. For example: i++;

Question: When we execute the loop, what will be the minimum no of iterations for the do while loop?
Answer: When we execute a loop, the minimum no of iterations for the do while loop is one because it is a post test loop. In this loop, body of the ‘do while’ loop is executed first than the test-condition is tested. Therefore, body of the ‘do while’ loop must exeute at least once, even if the condition becomes false initially.

Question: How can we represent the null statement in the loop?
Answer: Loops are the iterative control statements which are used to repeat the set of instructions on the program.
There are three loops – for, while and do-while in C language. In any of these loops, if we want to represent the null
statement, we use semicolon (;) symbol. For example:
for(i=1;i<=5;i++)
{
; // it shows the null statement in loop
}

Question: How working of while loop is terminated?
Answer: While loop is a pre-test loop. Its body is executed only if its conditional expression becomes true. If this
conditional-expression evaluates to false, the while loop gets terminated and it will stop repeatition of execution of
it’s body.