Question

I have one charater pointer array which points to the some stirngs

every element points to some strings
one thing in mind strings have only 1 and 0 .

for example

i have character pointer that stores string like “100110” so its takes 6 bytes to store but i want to store this in bits so i reduce memory occpuied.

Answer 1

In C style, something like this should work:

char* str = "100101";
unsigned out = 0;

for (int i = 0; str[i]; i++) {
   out = (out << 1);
   if (str[i] == '1')
      out++;
}

(I cannot test this for now, so please correct me if I’m wrong)

Explanation:

str = "100101"
out = 0000 0000 0000 0000

i = 0:
   out = 0000 0000 0000 0000 (out << 1)
   out = 0000 0000 0000 0001 (out++ because str[0] == '1')

i = 1:
   out = 0000 0000 0000 0010 (out << 1)

[...]

i = 5:
   out = 0000 0000 0010 0100 (out << 1)
   out = 0000 0000 0010 0101 (out++ because str[5] == '1')