val *=val;

char tmpstr[20]; // Temporary string buffer

sprintf(tmpstr, "[%i]", val); // Create string as this format: [num^2] <-- there is an invisible null at the end of this string.

uint8_t i=0;

while(tmpstr[i]){ // This while will only stop when it reaches a "null" (End of string, aka '\0')

UARTsend(tmpstr[***]); // Send the i'th character }

What do I use for *** to send the i'th character?