Real numbers take up two words (four bytes) like long integers, but real numbers use decimals to represent data, such as 88.39, which is a real number type. In programs, general symbols are real numbers or floating-point numbers; ; The long integer is the double integer you said, which can only represent integers, not decimals, such as 888833234. This is a long integer.

Integer is 1 word (2 bytes), which means any integer between -32768 and -32767. It takes up the same space as word data, but the difference is that integer can represent negative numbers, such as -235, or positive numbers, such as 32 12.

These are the basic knowledge in the computer field.