C++ Reading from file incorrectly - c++

Question

There is a certain problem that I would like to have help with. Here is how it goes:
I'm using the following code to read a certain amount of characters into a char array to process later:
char str[15]; // first 16 characters that i need to get from file
std::ifstream fin("example.txt");
if(fin.is_open()){
std::cout<<"File opened successfully \n";
for(int i = 0; i<=15; i++)
{
fin.get(str[i]); //reading one character from file to array
}
}
else{
std::cout<<"Failed to open file";
}
std::cout<<str;
It works fine for the first 4 or even 5 characters, but when it reaches to 8 it starts to print out garbage characters.
Contents of the example.txt file, from which i read text.
The Quick Brown Fox Jumped Over The Lazy Dog The Quick Brown Fox Jumped Over The Lazy Dog
Output when I read 8 characters:
The Quic�j�
Output when I read 16 characters:
The Quick Brown ASCII
Why is this happening and where did the 'ASCII' come from when I try to read certain length from a file?
And lastly, what kind of code should I utilize if I want to get specific lengths from a file? For example if I want to read the first 4 or 8 or 16 or even 20 characters? It doesn't necessarily have to be into a char array, it can be saved into a string.
Thank you in advance.

Answer 1

Your char array is only 15 chars long. So this line goes out of bounds:
for(int i = 0; i<=15; i++)
If i is equal to 15 that's one too many because your array counts from 0 to 14.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 <= count them!
There are 15 places starting at 0 ending at 14
Also when strings are stored in memory they have to be terminated by a null character '\0'. Otherwise the function that prints them doesn't know when to stop, which is probably where your garbage is coming from.
So, because the null terminator takes one of your 15 spaces, that only leaves you with 14 to read from the file.
So:
for(int i = 0; i < 14; i++)
{
fin.get(str[i]); //reading 14 characters (0-13)
}
str[14] = '\0'; // add the string terminator at the end of the array.
See if that works.