Pointer Related: Array, Structure, Single Pointer (*), Double Pointer (**), Reference (&)
C Pointer
Reply
Monthly Archives: July 2013
Common Bit Manipulation
bool getBit(int num, int shift)
{
return ( (num & (1 << shift)) != 0);
}
int setBit(int num, int shift)
{
return ( num | (1 << shift));
}
int clearBit(int num, int shift)
{
int mask = ~ (1 << shift);
return num & mask;
}
int clearBitMSBthroughShiftBit(int num, int shift)
{
int mask = (1 << (shift )) -1;
return num & mask;
}
int clearBitMSBthroughShift0(int num, int shift)
{
int mask = ~ ((1 << (shift +1 )) -1);
return num & mask;
}
int updateBit(int num, int shift, int v) //set i-th bit = v
{
int mask = ~ (1 << shift);
return (num & mask) | (v << shift);
}
Check Little Endian or Big Endian
int val = 0x0D0C0B0A;
char c = *((char *)(&val));
if (c == 0x0A)
cout<< "little endian machine"<<endl;
else if(c == 0x0D)
cout<< "big endian machine"<<endl;