//------------------------------------------------------------------
//
// More examples of string handling
//
// Simon Parsons
// April 30th 2007
//
//------------------------------------------------------------------

// Include C++ library definitions


#include <iostream> // For input and output
#include <string>   // To handle strings

using namespace std;


//------------------------------------------------------------------
//
// Function prototypes

void noChange(string);
void change(string &);

//------------------------------------------------------------------
//
// The main method

int main()
{

    // Variable definitions

    string dna = "ggtataccggaa"; 

    // First call the function with a regular parameter

    cout << "Before calling noChange" << endl;
    cout << dna << endl;
    noChange(dna);
    cout << "After calling noChange" << endl;
    cout << dna << endl;
    
    // NOw call the function with a reference parameter

    cout << "Before calling change" << endl;
    cout << dna << endl;
    change(dna);
    cout << "After calling change" << endl;
    cout << dna << endl;

    return 0;
}

//------------------------------------------------------------------
//
// Function definitions

// The function that does not use a reference parameter

void noChange(string s)
{
    cout << "Replace tata with gaga in noChnage" << endl; 
    s.replace(s.find("tata"), 4, "gaga");
    cout << s <<endl;
}

// The function that does use a reference parameter

void change(string &s)
{
    cout << "Replace tata with gaga in chnage" << endl; 
    s.replace(s.find("tata"), 4, "gaga");
    cout << s <<endl;
}