Sams Teach Yourself C++ in 21 Days

You have explored operator precedence. And you have seen how parentheses can be used to change the precedence and to make preced ...

Creating Expressions and Statements 97 4 Quiz .................................................................................. ...

17: else 18: cout << “a-b does not equal c: “; 19: return 0; 20: } Enter the program from Exercise 2; compile, link, and ...

DAY 5 WEEK 1 5 Organizing into Functions Although object-oriented programming has shifted attention from functions and toward ob ...

What Is a Function? ............................................................................................ A function is, ...

Organizing into Functions 101 5 When you call a function, it can do work and then send back a value as a result of that work. Th ...

Although you can define the function before using it, and thus avoid the necessity of cre- ating a function prototype, this is n ...

Organizing into Functions 103 5 that the function prototype does not need to contain the names of the parameters, just their typ ...

Listing 5.1 demonstrates a program that includes a function prototype for the Area() function. LISTING5.1 A Function Declaration ...

Organizing into Functions 105 5 Also note that the parameter names in the prototype are lengthand width, but the para- meter nam ...

Local variables are defined the same as any other variables. The parameters passed in to the function are also considered local ...

Organizing into Functions 107 5 With the call of Convert()on line 13, execution jumps to the first line of the Convert() functio ...

15: std::cout << “\nBack in main, x is: “ << x; 16: return 0; 17: } 18: 19: void myFunc() 20: { 21: int x = 8; 22: s ...

Organizing into Functions 109 5 On line 33,MyFunc()goes out of scope, and its local variable xbecomes unavailable. Execution ret ...

Main. Before swap, x: 5 y: 10 Swap. Before swap, x: 5 y: 10 Swap. After swap, x: 10 y: 5 Main. After swap, x: 5 y: 10 This progr ...

Organizing into Functions 111 5 6: { 7: using namespacestd; 8: 9: cout << “x from main: “ << x << endl; 10: co ...

it was in main(). On line 25, however, when the variable name yis used, the local vari- able yis used, hiding the global variabl ...

Organizing into Functions 113 5 More About Function Arguments .................................................................. ...

More About Return Values .................................................................................. Functions return a v ...

Organizing into Functions 115 5 23: cout << “\ninput: “ << input << “ doubled: “ << result << “\n” ...