Convert numbers to strings with control over format:
// Integer to string
s := strconv.FormatInt(255, 16) // "ff" (hex)
s = strconv.FormatInt(255, 2) // "11111111" (binary)
// Float to string
s = strconv.FormatFloat(3.14159, 'f', 2, 64) // "3.14"
FormatFloat parameters: value, format ('f' for decimal), precision, and bit size. Use 'e' for scientific notation, 'g' to let Go choose.