The basic data types of C language are divided into character type, integer type, long integer type and floating point type, and the range of values is as follows:

Integer variable is a computer language. In C language, the values of integer variables can be decimal, octal and hexadecimal, but binary numbers are stored in memory. Variables, as the name implies, are variables whose values can be changed, and integer variables represent integer data.

Variables are naturally relative to constants. Constants are fixed numbers, such as 1, 2, 3, 4.5, 10.6 ... and variables are based on the concept of X that we learned in primary school. We can make it 1 or 2, and we hope it will be decided by our program.

There are several kinds of mathematics in our primary school, positive, negative, integer and decimal. In C language, the names are different from what we learned in mathematics, and the data size is limited.