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This article mainly introduces "what is C language expression". In daily operation, I believe that many people have doubts about what C language expression is. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful for you to answer the question of "what is C language expression?" Next, please follow the editor to study!

C language expression

1. Arithmetic operator

The unary operator does nothing, and it doesn't exist in classical C.

When an int Operand is mixed with a float Operand, the result is float.

The operator% requires the operation of dozens of integers. When the operator / and operator% is used for negative operands, the result is difficult to determine.

As a general rule, the C language allows grouping in parentheses in all expressions.

The left and right combinations of the operator.

2. Assignment operator

If the types of v and e are different, the assignment will convert the value of e to the type of v when the assignment occurs.

In C language, assignment is an operator like +. That is, the assignment operation produces the result. The value of the assignment expression vaccoune is the value of v after the assignment operation.

Formatted input / input of C language

Printf function

The printf function is used to display the contents of a format string and insert possible values at a specified position in the string. The format string includes normal characters and conversion instructions.

Conversion description:% m.pX format or-m.pX format. M (minimum field width): specifies the minimum number of characters to display; p (precision), + and-indicate right and left alignment.

Escape sequence: causes the string to contain some special characters without causing problems with the compiler. Alarm (ringing) character:\ a; newline character:\ n; horizontal tab:\ t.

Scanf function

Check that the number of conversion instructions matches the number of input variables; check that each transformation is appropriate for the corresponding variable; scanf each call variable needs to be preceded by &.

Many professional programmers avoid using scanf functions and instead read all the data in character format and then convert it to numeric form.

The scanf function essentially makes a "pattern match", trying to match the input character set to the conversion description.

When the user enters from the keyboard, the program does not read the input, but puts the user's input in a hidden buffer, which is read by the scanf function.

At this point, the study of "what is a C language expression" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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