Control Constructs

  1. What is wrong with the following? 
    
int x;
if (x=1)
	x++;

  2. What is wrong with the following? 
    
int x, y, z;

if (x > y && < z)
	x = y;

  3. Write an extract of code to test if the variable x is a positive number?

  4. Write an extract to test if the variable x is a positive and even number?

Answers

  1. The test should be x== 1, with x=1 this will assign the value of 1 to x rather than cecking if x is a 1.

  2. Assuming that it is intended to compare z to z, the test should be x > y && x < z 

  3.  if (x > 0)


  4.  if (x > 0 && x%2 == 0)

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