Exercise 3-7 (Strings passed by value, address, reference)

Chapter_3     Exercise_3-6     Function_call

Modifiers     Exercise_3-8

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Exercise 3-7     TCP1, p. 227

Exercise 3-7. Create two functions, one that takes a string* and one that takes a string& as argument. Each of these functions should modify the outside string object in its own unique way. In main(), create and initialize a string object, print it, then pass it to each of the two functions, printing the results.

Strings.cpp         download

#include <iostream>
#include <string>
using std::string;
using std::cout;
using std::endl;

void passByValue(string);
void passAddress(string*);
void passReference(string&);

int main()
{
string str = "Hello!";

cout << str << endl; // Hello!
passByValue(str); // Howdy!
cout << str << endl; // Hello!
passAddress(&str); // Hi!
cout << str << endl; // Hi!
passReference(str); // Halo!
cout << str << endl; // Halo!

return 0;
}

void passByValue(string s)
{
s = "Howdy!";
cout << s << endl;
}

void passAddress(string* sp)
{
*sp = "Hi!";
cout << *sp << endl;
}

void passReference(string& sr)
{
sr = "Halo!";
cout << sr << endl;
}

/*
g++ Strings.cpp -o Strings
./Strings
Hello!
Howdy!
Hello!
Hi!
Hi!
Halo!
Halo!
*/

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