Compare while and do-while control structures:

While loop:

§ This is called entry control loop

§ While loop gets executed as long as the condition is true

§ Condition is evaluated first and then statements.

§ Minimum number of execution in this case is “zero”

§ syntax:

while ( condition )

{

Statements

}

Example:

int i=0;

while( i<10 )

{

System.out.println(“hello”);

i=i+1;

} /* prints hello 10 times */

Do while loop:

§ This is called exit control loop.

§ Do-While loop gets executed as long as the condition is true

§ Statements get executed first and then Condition.

§ Minimum number of execution in this case is “one”

§ Syntax:

do

{

Statements

}while(condition);

Example:

int i=0;

do

{

System.out.println(“hello”);

i=i+1;

} while(i<10); /* prints hello 10 times */