//Program to demonstrate the function string_copy
#include <iostream.h>
#include <string.h>

void string_copy(char target[], const char source[], int target_size);
//Precondition: target_size is the declared size of the string variable target. 
//The array source contains a string value terminated with '\0'. 
//Postcondition: The value of target has been set to the string value in 
//source, provided the declared size of target is large enough. 
//If target is not large enough to hold the entire string, a string equal 
//to as much of the value of source as will fit is stored in target.

int main( )
{
    char short_string[11]; //Can hold strings of up to 10 characters.
    string_copy(short_string, "Hello", 11);
    cout << short_string << "STRING ENDS HERE.\n";

    char long_string[] = "This is rather long.";
    string_copy(short_string, long_string, 11);
    cout << short_string << "STRING ENDS HERE.\n";
    return 0;
}

//Uses string.h:
void string_copy(char target[], const char source[], int target_size)
{
    int new_length = strlen(source);
    if (new_length > (target_size - 1))
        new_length = target_size - 1; //That is all that will fit.
    int index;
    for (index = 0; index < new_length; index++)
        target[index] = source[index];
    target[index] = '\0';
}