Data type

In modern language like Python, JavaScript you can even not working with data types (modern days you can use some ways for use types).

• Int: -2^31 to 2
• Float: 32-bit, 1 bit sign bit, exponent part 8-bit, mantissa 23-bit
• Char: -128 to 127
• String: char [10] = "Studying";
• Void: no value, TODO: is void a type?