aminmohsalih
asked on
read_bit
Iam have program in C++Builder and I want to read specific bit in String Can I do that and how??
exmple(A=(1000001)bin I want to know the fouth bit is 0 or the last bit is 1)
exmple(A=(1000001)bin I want to know the fouth bit is 0 or the last bit is 1)
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const itn BitPerChr = 8*sizeof(char); // Might need to be changed
// for machines that don't store 8 bits per byte.
bool TestStringBit(const char *Str, // string to extract from.
int BitNum) // 0-based bit number of bit to extract.
{
int BytNum = BitNum / BitPerChr;
BitNum %= BitPerChr;
assert(BytNum < strlen(Str)); // Might want this as a permenant test.
int Byt = Str[BytNum]; // Get desired byte.
int Msk = 1 << (BitNum-1); // mask for the desired bit.
return (Byt & Msk) != 0;
}