Write the values of r and s after the execution of the following code.

int p = 11, q = 21, r, s; 
r = ++q;
s = p++; 
r++;

Observe the following code and find that how many times will the loop execute?

int sum = 0, score = 0;
double t;
do
{
    score = score + 1; 
    sum = sum + score;
} while(score <= 3);
t = sum / 3;

If a = 8, find the value of a -= ++a + a++ + 4 - a + 6.

Rewrite the following code using for loop.

int i = 1; 
int d = 5; 
do
{
    d = d * 2;
    System.out.println(d); 
    i++;
} while(i <= 5);