What is the function and classification of c statement
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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