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If, Else And Switch: Basic Control Structures - Con't

In many cases you will also want to check for other cases, if case 1 is not true. You could write:

if(test-expression1)
   body1
if(test-expression2)
   body2
if(test-expression3)
   body3

but these statements would be tested independently from each other. Suppose case 3 is correct, but case 2 also. Or case 1 and case 2 are true, but you want to execute body3 only if test-expression1 and test-expression2 are false. You could use the following statement:

if(test-expression1)
   body1
if(test-expression2)
   body2
if(test-expression1==false && test-expression2==false)
   body3

Doing that, it might occur that both body1 and body2 are being executed, if test-expression1 AND test-expression2 are true. If you want only one of the three bodys to be executed, you must use the following:

if(test-expression1)
   body1
else if(test-expression2)
   body2
else
   body3

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