What does this code means?

I have no idea what does this code means even though the book explained it. I think maybe it didn't explain well enough. Can anyone tell me what does this code means?

Code:

---

//This programme shows an example of using an if statement to check for no input
#include <iostream>
#include <string>

int main()
{
    using namespace std;

    char response[256];

    cout<< "What is your name? ";
    cin.getline(response,256);

    if (strlen(response) == 0)
    cout<< "You must tell me your name...";
    else
    cout<< "It's nice to meet you, "<< response;

    return 0;
}

---

I also have no idea about the char 256 thing =,=

Can you please specify more precisely what part you don't understand?

--
Mats

Quote:

---

Originally Posted by matsp

Can you please specify more precisely what part you don't understand?

--
Mats

---

Erm...lets see...

First, the char response[256]. I only know that it's trying to declare a variable response. I have no idea about the [256].

Second, the cin.getline(response,256).

Third, if (strlen(response) == 0)

That's about all I guess xD

this sample uses C-strings that are actually simple arrays of chars

you better start with the sample that deals with the C++-strings that should look like

Code:

---

string response;

---

Quote:

---

Originally Posted by junkeat90

Erm...lets see...

First, the char response[256]. I only know that it's trying to declare a variable response. I have no idea about the [256].

---

An array of char, with 256 elements.

Quote:

---

Second, the cin.getline(response,256).

---

Read a line of text, max size 256 chars.

Quote:

---

Third, if (strlen(response) == 0)

---

Check the length of the input, if it's zero, then nothing was entered.

--
Mats

lol..I have no idea about array...guess I'll just continue reading the book in order to explore C++ deeper. Anyway, thank you all for trying to explain. I appreciate it very much.

Quote:

---

Originally Posted by junkeat90

lol..I have no idea about array...guess I'll just continue reading the book in order to explore C++ deeper. Anyway, thank you all for trying to explain. I appreciate it very much.

---

Yes, I expect that you will have to read more about arrays. It is a fairly important part of computer programming in general.

--
Mats