Selection-WE6-P1

Section 5.13 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 no else branch

Subsection 5.13.1

Exercises Exercises

1.

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;

2.

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;

3.

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;

4.

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;

5.

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;

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