The If Statement

• Syntax:
• if (boolean expression) statement;
• Semantics
  • Evaluate the boolean expression
  • If the boolean expression is true, execute the statement.
• Normal usage

  if (boolean expression) {
      statements;
  } 

• Be careful on this one without code blocks.
• What will be the result of this code?:

  int x = 7;
  
  if (7 == x) 
     cout << "x is 7" << endl;
     x = 14;
  
  cout << x << endl; 

• If you have a choice, prefer if-else to two if statements.
  • Consider a program which prints a different message to people over and under 18.

  • int age;
    if (age < 18) {
       cout << "You are a minor" << endl;
    }
    
    if (age >= 18) { 
       cout << "You are an adult" << endl;
    } 

  • I would prefer

  • int age;
    if (age < 18) {
       cout << "You are a minor" << endl;
    } else  {
       cout << "You are an adult" << endl;
    } 

• Write a program which asks for an hourly wage, hours worked and if the person receives overtime pay if they exceed 40 hours a week. Print their pay. (overtime.cpp)