오뇽

#include <iostream>

const int nMax = 10;

int main( )
{
	bool bSitch = true;
	int sum = 1;

	for( int i=2 ; i<=nMax ; ++i )
	{
		if( bSitch == true )
		{
			sum += i;
		}
		else
		{
			sum -= i;
		}
		bSitch = !bSitch;
	}

	printf( "%d\n", sum );

	return 0;
}

#define	_NORMAL
#define	MAX 100

#include <stdio.h>

int main( )
{
	int i=0;
	int sum=0;

#ifdef _NORMAL
	for( i=1 ; i<=MAX ; i++ )
	{
		sum += i;
	}
#else
	sum = ( MAX+1 ) * ( MAX/2 );
#endif

	printf( "%d\n", sum );

	return 0;
}