Write a byte to a file in C

Question

I have a byte declared as unsigned int 0b11010101how can I write this to a binary file as 1 byte? I know fwrite takes type const void *as a buffer but I don't know how to write my byte if it's represented as an unsigned int.

Answer 1

Perhaps like this, you better not write one byte of an int because of endianness. Convert to unsigned char first.

unsigned int intval = 0b11010101;       // assuming compiler likes it
unsigned char charval = intval;
fwrite (&charval, 1, 1, stream);