masks.cpp

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#include "masks.h"

bool checkbit( int &number, int bit_number )
{
    if ( (bit_number > 31) || (bit_number < 0) )
        return 0;
    if ( ( number&(1<<bit_number) ) != 0 )
        return 1;

    else
        return 0;
}

void dosetbit( int &number, int bit_number )
{
    if ( (bit_number > 31) || (bit_number < 0) )
        return;
    number = ( number|(1<<bit_number) );
}

void unsetbit( int &number, int bit_number )
{
    if ( (bit_number > 31) || (bit_number < 0) )
        return;
    int temp = 0;
    if (bit_number != 0)
        temp = ( ( 0xffffffff<<(bit_number+1) )|( 0xffffffff>>(32-bit_number) ) );
    else
        temp = ( 0xffffffff<<(bit_number+1) );
    number = number&temp;
}

void flipbit( int &number, int bit_number )
{
    if ( (bit_number > 31) || (bit_number < 0) )
        return;
    if (checkbit( number, bit_number ) == 1)
        unsetbit( number, bit_number );
    else
        dosetbit( number, bit_number );
}

float Delta( float a, float b )
{
    float ans = a-b;
    if (ans < 0)
        return -1.0*ans;
    else
        return ans;
}