Sams Teach Yourself C++ in 21 Days

Local variables are defined the same as any other variables. The parameters passed in to

the function are also considered local variables and can be used exactly as if they had

been defined within the body of the function. Listing 5.2 is an example of using parame-

ters and locally defined variables within a function.

LISTING5.2 The Use of Local Variables and Parameters

1: #include <iostream>

2:

3: float Convert(float);

4: int main()

5: {

6: using namespace std;

7:

8: float TempFer;

9: float TempCel;

10:

11: cout << “Please enter the temperature in Fahrenheit: “;

12: cin >> TempFer;

13: TempCel = Convert(TempFer);

14: cout << “\nHere’s the temperature in Celsius: “;

15: cout << TempCel << endl;

16: return 0;

17: }

18:

19: float Convert(float TempFer)

20: {

21: float TempCel;

22: TempCel = ((TempFer - 32) * 5) / 9;

23: return TempCel;

24: }

Please enter the temperature in Fahrenheit: 212

Here’s the temperature in Celsius: 100

Please enter the temperature in Fahrenheit: 32

Here’s the temperature in Celsius: 0

Please enter the temperature in Fahrenheit: 85

Here’s the temperature in Celsius: 29.4444

On lines 8 and 9, two floatvariables are declared, one to hold the temperature

in Fahrenheit and one to hold the temperature in degrees Celsius. The user is

prompted to enter a Fahrenheit temperature on line 11, and that value is passed to the

function Convert()on line 13.

OUTPUT

106 Day 5

ANALYSIS