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.
The syntax of a do...while loop in C++ is:
}while( condition );
Note: 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.
using namespace std;
int main ()
// Local variable declaration:
int a = 10;
// do loop execution
cout << "value of a: " << a << endl;
a = a + 1;
}while( a < 20 );
When the above code is compiled and executed, Output Will Be :
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
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