Summary of IF Statements

If statements can have any of the formats below: 
//One statement to execute when True:
  if (Boolean expression) statement;
  
//One statement to execute when True, one when false:
  if (Boolean expression) 
    statement; 
  else statement;

//Using blocks: one or more statements to execute when true, one or more when false:
  if (Boolean expression) {
    statement;
    statement;
  } // end of true block
  else {
    statement;
    statement;
  } // end of false block

//If Else Group: more than one condition to test

  if(Boolean expression1) {
    statement;
    statement;
  } // end of block for first condition
  else if(Boolean expression2) {
    statement;
    statement;
  } // end of block for second condition
  // as many else if blocks as needed
  else { // block to execute if none of the other conditions is met
    statement;
    statement;
  {
Example of an else if block: Test this by putting values for avg in the URL. TEST PAGE 
if($avg>=90) echo 'A';
else if($avg>=80) echo 'B';
else if($avg>=70) echo 'C';
else if($avg>=60) echo 'D';
else echo 'F';

INDEX, Boolean Values, if/else, Summary, Compound Conditions: AND && and OR ||, SWitch
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