17. Execute the while loop in C,

17. Execute the while loop in C,

 

There are three main methods for code execution in programming. (1) sequential execution, that is, one statement and one statement are executed in order; (2) conditional execution, that is, if... else. when a certain condition is met, some code is executed; (3) when a certain condition is met, some code is repeatedly executed. Many complex software applications are produced by the magical combination of these three methods. We have already talked about sequential execution and conditional execution. In this exercise, we need to know about loop execution.

In C #, we often use two types of cyclic execution in our daily work. (1) while loop; (2) for loop; of course, C # provides more than two methods for loop execution. If you are interested, check it online. If you still want to know, please contact me.

1. while Loop

While (test condition)

{

When the condition is true, the statements in braces are cyclically executed.

}

When the condition is false, the loop ends and the following statement is executed.

 

 

The execution process of the whille loop is like this.

1. First Judge the test condition of while. If it is true, execute the statement in braces.

2. Execute the statement in braces and then judge the test condition of while. If it is still true, continue to execute the statement in braces.

3. If it is false, end the while loop. Execute the following statement.

 

 

The following is an example to better understand the while loop.

You create a project. The solution name is Sloution17, the project name is Exercise17, and the project type is console program. Click Program. cs. Add the code to it.

Briefly explain this program.

1. Row 17th I ++ is an expression that increases I by 1 each time. For example, I is equal to 1 at the beginning. After the I ++ statement is run, I is changed to 2;

2. This program outputs the current I value in the dos window, and then increases I by 1. If I is not greater than 10, the loop continues.

 

Running result

 

 

Exercise

1. Read this code and add comments to important statements.

2. If 17th lines of code are injected, what will the result of running the program be?

3. modify the code so that the program can output the I value from 0 to 20 to the dos window.

 

 

 

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