How to solve this is C code:

How long, on your computer, does it take to find a hash value that ends with $3$ bytes of

zeros.

Use SHA$256.$ Hash this structure:

typedef struct

$\{$

char data$[50]$;

long nonce;

$\}$;

Put something in data. Vary the nonce until you get a hash value with the desired

number of zeros.