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

etiquoe · Jul 6, 2011

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:

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:

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

and this:

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 · Jul 6, 2011

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 · Jul 6, 2011

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.

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

etiquoe

Member level 1

hamidmoallemi

Full Member level 2

srizbf

Advanced Member level 5

Similar threads

Code C++ - [expand]
1 2 3 4 5 6 7	#include <iostream> using namespace std; void main () { cout << “Hello, World!\n”; }

Code C++ - [expand]
1 2 3 4 5 6 7 8 9 10 11 12 13 14	#include <iostream> using namespace std; int main () { int i = 1; while (i<=257) { cout << i << "\n"; ++i; } }

Code C++ - [expand]
1 2 3 4 5 6 7 8	#include <iostream> using namespace std; void main () { cout << “Hello, World!\n”; getchar(); }

Code C++ - [expand]
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15	#include <iostream> using namespace std; int main () { int i = 1; while (i<=257) { cout << i << "\n"; ++i; } getchar(); }

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

etiquoe

Member level 1

hamidmoallemi

Full Member level 2

srizbf

Advanced Member level 5

Similar threads

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