3.7.1. Selection-WE6-P1¶

Subgoals for Evaluating Selection Statements

Diagram which statements go together.
For if-statement, determine whether expression is true or false.
If true, follow true branch. If false, follow else branch (OR do nothing if there is no else branch).

Select-WE6-P1

Q16: Click on the if-statement that must be TRUE in order to execute the line ``e = 3;`` in the following code.

if (x > y)
{
   if (a > b)
      e = 1;
   else
      e = 2;
}
else
   if (a < b)
      e = 3;
   else
      e = 4;

Q17: Click on the if-statement that must be FALSE in order to execute the line ``e = 2;`` in the following code.

if (x > y)
{
   if (a > b)
      e = 1;
   else
      e = 2;
}
else
   if (a < b)
      e = 3;
   else
      e = 4;

Use this given setup for each of the questions below.

int alpha = 2, beta = 1, delta = 3, eta = 0, gamma = 0;
double omega = 2.5, theta = -1.3, kappa = 3.0, lambda = 0.0, rho = 0.0;

Q18: After executing the following code, the value in variable eta is .

if (omega > kappa)
{
   if (alpha > delta)
      eta = 5;
   else
      eta = 4;
}
else
   if (alpha < delta)
      eta = 3;
   else
      eta = 2;

Q19: After executing the following code, the value in variable a is and the value in variable b is .

int a = -5;
int b = 5;
if (a < 0)
   if (b > 0)
      a = b;
else
   a = b + 10;
   b = b + 3;

Q20: After executing the following code, the value in variable x is and the value in variable y is .

int x = -8;
int y = 10;
if (x < 0)
{
   if (y < 0)
   x = y;
}
else
   x = y +10;
   y = x + y;