Page 200 - CA_Blue( J )_Class9
P. 200
In a while loop, the condition is checked before the execution of the loop. Hence, we can call it an "Entry Controlled
Loop”.
Example of for loop and while loop working as an Entry Control loop:
For Loop While Loop
int i; int i=1;
for(i=1;i<=0;i++) while(i<=0)
{ {
System.out.println("Will not print"); System.out.println("Will not print");
} i++;
System.out.println("Entry Control }
loop"); System.out.println("Entry Control
Loop”);
The above programs will only print the line "Entry control loop”. This is because while entering the condition is
checked and it is false.
9.2.4 The do-while Loop
Java do-while loop is used to execute a set of statements repeatedly if the Start
number of iterations is not known. However, the do-while loop will execute at
least once even if the test condition is false. This is because the condition lies
at the end. Body of do...while loop
The syntax of the do-while loop is:
Initialization;
true Conditional
do
Expression
{
false
// job performed by the body of the loop
increment or decrement; Stop
} while (condition for testing);
Program 4 Print sum of first 5 natural numbers.
1 class dowhile_sum
2 {
3 public static void main()
4 {
5 int i=1,s=0;
6 do
7 {
8 s=s+i;
9 i++;
10 }
11 while(i<=5);
198 Touchpad Computer Applications-IX

