If Statements review

Of the following if statements, which one correctly executes three instructions if the

condition is true?

• if (x < 0)

  a = b * 2;

  y = x;

  z = a – y;

• {

  if (x < 0)

  a = b * 2;

  y = x;

  z = a – y;

  }

• if { (x < 0)

  a = b * 2;

  y = x;

  z = a – y ;

  }

• if (x < 0)

  {

  a = b * 2;

  y = x;

  z = a – y;

  }

Which of the sets of statements below will add 1 to x if x is positive and subtract 1 from x if x is negative but leave x alone if x is 0?

• if (x > 0) x++;

  else x--;

• if (x > 0) x++;

  else if (x < 0) x--;

• if (x > 0) x++;

  if (x < 0) x--;

  else x = 0;

• if (x == 0) x = 0;

  else x++;

  x--;

If x is currently 0, a = 5

and b = 5, what will x become after the statement is executed?

if (a > 0)

if (b < 0)

x = x + 5;

else

if (a > 5)

x = x + 4;

else

x = x + 3;

else

x = x + 2;

• 0

• 2

• 3

• 4

• 5

If x is currently 0, a = 0

and b = - 5, what will x become after the statement is executed?

if (a > 0)

if (b < 0)

x = x + 5;

else

if (a > 5)

x = x + 4;

else

x = x + 3;

else

x = x + 2;

• 0

• 2

• 3

• 4

• 5

If x is currently 0, a = 1

and b = -1, what will x become after the statement is executed?

if (a > 0)

if (b < 0)

x = x + 5;

else

if (a > 5)

x = x + 4;

else

x = x + 3;

else

x = x + 2;

• 0

• 2

• 3

• 4

• 5