Edit your registry:

HKEY_CURRENT_USER\Console
FullScreen REG_DWORD 0 or 1

#include <windows.h>
#include <stdio.h>

#define FULLSCREEN 1
#define WINDOWED   0

char err[256] = "Everything Oki Doki";

// Rückgabe boolean-style.
// 1 == OK
// 0 == Kagge
int SetConsoleWindowMode( int md )
{
	HKEY key;
	DWORD Type = REG_DWORD;
	DWORD	sizebuf;
	int current_value;

	if ( md != FULLSCREEN && md != WINDOWED )
	{
		sprintf( err, "%s %d", "Unknown Mode: ", md );
		return 0;
	}

 	if ( ERROR_SUCCESS != RegOpenKey( HKEY_CURRENT_USER, "Console", &key ))
	{
		sprintf( err, "%s\n", "Failed on RegOpenKey" );
		return 0;
	}

	if ( ERROR_SUCCESS != RegQueryValueEx( key, "FullScreen", NULL, &Type, 
                        (unsigned char*)&current_value, &sizebuf )) 
	{
		sprintf( err, "%s\n", "Failed on RegQueryValueEx" );
        RegCloseKey(key); 
		return 0;
	}

	if ( current_value == md )
	{

		if ( md == FULLSCREEN )
			sprintf( err, "%s\n", "Info: Fullscreen Mode already set." );
		  else
			sprintf( err, "%s\n", "Info: Windowed Mode already set." );

		RegCloseKey(key);
		return 0;
	}

	if ( ERROR_SUCCESS != RegSetValueEx( key, "FullScreen", 0, REG_DWORD, 
																(unsigned char*)&md, sizeof(md) ))
	{
		sprintf( err, "%s\n", "Failed on RegSetValueEx" );
		RegCloseKey(key);
		return 0;
	}

	RegCloseKey(key);

	return 1;
}

int main()
{
	if ( !SetConsoleWindowMode( WINDOWED ) )
		puts(err);
	return 0;
}

Im Zweifelsfall bitte auch folgende Hinweise beachten:
C/C++ Forum :: FAQ - Sonstiges :: Wohin mit meiner Frage?

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