Introduction to C-Programming As seen in ENGS 20

Section 9.13 Summary

• if (condition){
    statement;
  }
  

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• if (condition){
    statement1;
    statement2;
    ...
  }
  

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• if (condition){
    statement(s);
  } else {
    statement(s);
  }
  

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• if (condition){
    statement(s);
  } else if (other condition){
    statement(s);
  } else if (yet another condition){
    statements(s);
  } else {
    statement(s);
  }
  

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• There can be as many if-else cases as you would like.
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• The final else statement can be omitted if that makes sense.
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• && is the logical AND
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• || is the logical OR
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• ! is the logical NOT
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• DeMorgan 1: !(A && B) == (!A) || (!B)
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• DeMorgan 2: !(A || B) == (!A) && (!B)
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• < less than
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• > greater than
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• <= less than or equal
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• >= greater than or equal
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• == equal
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• != not equal
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• Operator precedence in logic expressions
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• Using a "flag" variable to represent true/false
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• Translating logical expressions from English to C
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• Negating logical expressions
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