Counting lines doesn't work

[alexp]

I am new to programming and am following a book about C++ programming. When I type the following code and click "Debug" I get a black screen and nothing happens. There is a printf function so I assume something is supposed to happen. Please help.

#include <stdio.h>

int main()
{

int c, nl;

nl = 0;
while ((c = getchar()) != EOF) {
if (c == '\n')
++nl;
}
printf("%d\n",nl);

return 0;
}

[Thomas1965]

The code works fine.
Output:

Line 1
Line 2
Line 3
^Z
3

Did you actually enter sth. ?

BTW. Are you sure that the book is about C++, the code is pure C.

[Peter87]

You are supposed to type multiple lines of text and press Ctrl+Z when you're done.

[alexp]

Thank you for the help. Still there is a problem. When I click Ctrl+Z, the program exits out. If i add #include <conio.h> and a _getch(); at the end, then the programs runs fine, why is that?

[Thomas1965]

Some IDE's (like Visual Studio) have this behaviour to close the console at the end of main.

[alexp]

Thank you!