why should i use getchar() function to make it work? [C++]

[etiquoe]

Hi everyone!

i started to learn C++. i'm totally newbie
i'm using Dev C++ compiler.
i tried to run some simple examples from tutorials, like this:

---

Code C++ - [expand]
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#include <iostream>
using namespace std;
 
void main () 
{
    cout << “Hello, World!\n”;
}

---

Or this:

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Code C++ - [expand]
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#include <iostream>
using namespace std;
 
int main ()
{
    int i = 1;
    
    while (i<=257)
    {
          cout << i << "\n";
          ++i;
    }
    
}

---

No Error when i compiled it, but nothing happen when i ran it. And then i tried to add getchar()function, like this:

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#include <iostream>
using namespace std;
 
void main () 
{
    cout << “Hello, World!\n”;
        getchar();
}

---

and this:

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Code C++ - [expand]
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#include <iostream>
using namespace std;
 
int main ()
{
    int i = 1;
    
    while (i<=257)
    {
          cout << i << "\n";
          ++i;
    }
    
    getchar();
}

---

Then it worked.

I don't really understand about getchar() function.why the two examples above can work after i add the line (getchar())?
anyone? please?


Regards

 

[hamidmoallemi]

getchar causes the program to wait for entering a character from user
in fact your programs work but maybe the window close immediately after working once

 

[srizbf]

i think you are trying to execute the program from the ide.

instaed , open a command prompt and type the name of your program.exe
(this is without getchar(0 line program)

you will see the output.