C++ LANGUAGE DO WHILE LOOP PAGE 50

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C++ LANGUAGE DO WHILE LOOP

do…while Loop 


Unlike for and while loops, which test the loop condition 
at the top of the loop, the do...while loop checks its 
condition at the bottom of the loop. 
A do...while loop is similar to a while loop, except that a 
do...while loop is guaranteed to execute at least one time. 

Syntax 

The syntax of a do...while loop in C++ is: 
do 
{ 
   statement(s); 
}while( condition ); 
Notice that the conditional expression appears at the end of 
the loop, so the statement(s) in the loop execute once before 
the condition is tested. 
If the condition is true, the flow of control jumps back up to 
do, and the statement(s) in the loop execute again. This process 
repeats until the given condition becomes false. 

Flow Diagram 
 
Example 
#include <iostream> 
using namespace std; 
  
int main () 
{ 
   // Local variable declaration: 
   int a = 10; 
 
   // do loop execution 
   do 
   { 
       cout << "value of a: " << a << endl; 
       a = a + 1; 
   }while( a < 20 ); 
  
   return 0; 
} 
When the above code is compiled and executed, 
it produces the following result: 

value of a: 10 
value of a: 11 
value of a: 12 
value of a: 13 
value of a: 14 
value of a: 15 
value of a: 16 
value of a: 17 
value of a: 18 
value of a: 19