Question

I have two chars = 4 bytes, that representing integer value (geted from stream).

How can I copy these into a primitive int variable?

Answer 1

You are better off reading 4 bytes as an int from the start. However to turn two char into an int you can use

char ch1, ch2;
int i = (ch1 << 16) + ch2; // or ch2 << 16 + ch1

You need to know whether the order is little or big endian.