18 C # executes the for loop,

18 C # executes the for loop,

 

In this exercise, we will introduce another important loop statement in C #, for loop.

 

For (expression 1; expression 2; expression 3)

{

Loop body

}

 

Expression 1: Generally, it is a value expression that assigns an initial value to the control variable;

 

Expression 2: A logical expression and a loop control condition. When the condition is true, statements in the loop body are cyclically executed.

 

Expression 3: Generally, it is a value expression that increments or reduces the number of control variables.

 

It seems abstract. Through actual examples, you can easily understand the for loop.

 

You create a project. The solution name is Sloution18, the project name is Exercise18, and the project type is console program. Click Program. cs. Add the code to it.

 

 

Briefly explain this program.

1. 14th rows are the core of the for loop. I is the control variable. Int I = 0; assign an initial value to control variable I;

2. I <= 10; it is a condition for loop control. When I <10, the statement in braces is executed;

3. I ++ controls variable increments. 1.

4. 17th rows are accumulated from 1 to 10. Computing 1 + 2 + 3 + 4 +... + 10.

 

Running result

 

Exercise

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

2. If you change the 14th lines of code to for (int I = 0; I <= 10;), what is the result of running the program?

3. What will happen if you change the code in line 3 to for (int I = 0; I ++?

4. modify the code so that the program can output the I value from 0 to 20 to the dos window, and calculate the accumulated result from 0 to 20.

 

 

 

 

Pay-as-you-go answers to questions C # encountered during the course of getting started.

Zero-basic learning C # beginners, most problems can be solved through self-study or the Internet.

HoweverThere are still some problems that are not so easy to solve and become a stumbling block to your learning. In the end, it may even cause you to lose your learning experience. Generally, when you get started with C # programming, you will encounter more than 20 to 30 problems that you cannot easily solve.

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