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What is the function and classification of C sentence? aiming at this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.

The function and Classification of C sentence

A function is the basic unit of a C program, and a function includes a declaration part and an execution part. The execution part is composed of one or more C statements, the function of which is to issue operation and operation instructions to the computer system, requiring the corresponding operations to be performed. A C statement is compiled to produce multiple machine instructions.

According to its functions, C language statements can be divided into two categories: operation statements used to describe computer operations and operations, and process control statements used to control the order of operation execution.

1. Expression statement

The operations and operations in C language are realized by expressions, and expression statements are widely used in programs. For example:

IBesides + / / this is an expression, not a statement

After execution, add 1 to the value of I

But it doesn't make any sense. After execution, the result of the operation is not saved, and the values of x and y remain unchanged.

(1) assignment statement

The assignment statement is composed of a semicolon after the assignment expression, and its function is to change the value of the variable.

For example:

I=x+y

(2) function call statement

The function call statement is composed of a semicolon after the function call expression, and its function is to make the called function executed.

For example:

Printf ("hello world.\ n")

(3) empty sentence

An empty statement consists of a semicolon.

two。 Flow control statement

The C language provides nine kinds of process control statements, which can be roughly divided into the following categories:

Select structure control statement: if … Else and switch

Loop structure control statements: for, while and do. While

End the loop statement: continue

Terminating loops and multiple branch statements: break

Unconditional transfer statement: goto

Function return statement: return

3. Compound statement

The C language allows one or more statements to be enclosed in curly braces {} to form compound statements, also known as statement blocks.

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