KPK Board 10th Class Computer Ch 5 Loop Structure Short Questions Answers

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Explain different types of looping structures with examples.

Ans. Looping Structure: A structure that repeats a statement or set / group of statements is known as looping structure. It is also known as repetitive structure.
In C /C ++ language, three types of looping structure are available. These are explained below
1. For loop:
The ‘for’ loop is used in that case where the number of loop iterations are known in advance i.e. to print the tables, counting etc.
The syntax is
For (Initialization ; Condition ; Increment / Decrement)
Body of the loop;
‘Initialization’ means the starting of loop. It defines the starting value of loop.
‘Condition’ is a relational expression. It specifies the test/ check condition on the basis of which the loop will execute. The looping statement will execute till the given condition is satisfied.
‘Increment / decrement’ is set to increase the number of looping iterations.
‘Body of loop’ consists of all those C – statements that will be repeated again till the end of loop. In case of single statement, the block is not defined but in case of more than one looping statement the block is defined inside the braces. { and}.
For (x=1 ; x<5 ; x ++)
Printf(“%d \ t”, x);
Here “x = 1” is looping initializations. “x<10” is a check condition and “x++” is looping increment. The “body of loop” consists of two statements that will repeat till the end of loop. When the condition ‘x<10’ because False, the loop will stop execution.
The output will come as
1 OK
2 OK
3 OK
4 OK
In order to print the number’s in descending order (i.e. 4, 3, 2, 1), the for loop will be used as
For (x = 4; x >0 ; x –)
Printf(“%d\t”, x);
Flowchart of “for” loop
While loop:

It is another common type of looping structure available in C/C++ language. It can perform all the same actions as performed by ‘ for’ loop however it is useful in that situations where the number of loop iterations are not known in advance. For example the users are asked to enter/ input the positive numbers and in case of negative number the loop will stop executing. Now it is not confirmed that how much positive number will be inputted.
Body of loop;
Increment / Decrement;
‘While’ is a C – reserved word. ‘Condition’ is a Boolean expression that will return True / False. If it is satisfied the body of loop will execute otherwise it will stop.
Following programming code will the message ‘Pakistan’ 10 times.
Int = 1;
While(x <= 10)
X = x +1 ;
The “while” loop is ideally used when the number of iterations are not known in advance. Let us write a C – program that will ask the users to enter / input the +ve number and in case of –ve number the loop will stop execution. The program will count the positive number and display them.
Void main
Int x, c;
Clrscr ()
X = 0;
C = 0;
Printf(“Enter Positive Number, Negative number will end the program\n” );
Printf(Enter new Number \n”)
C = c + 1;
Printf(“you enetered %d positive number \n”,c)
Printf(“The loop runs for %d times”,c);
Enter Positive number, Negative number will end the program
Enter new Number
Enter new Number
You entered 2 positive Number
The loop runs for 2 times.
do while loop:

It is third looping structure available in C language. It works with rather different syntax. In this loop, the text/ check condition comes after the loop iteration is processed. It is post- test loop. The body of loop will must run at least once
Body of the loop;
Increment / Decrement;
While (condition);
‘do’ and ‘while’ are C-reserved words. The do-while loop starts with the ‘do’ statement.
The following programming code will print the message ‘Pakistan’ 10 times.
Int = 1;
FLOWCHART for ‘do while’ loop.
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