C ++ basic tutorial-for Loop statements

For Loop

Sometimes we need to deal with repetitive work. At this time, using cyclic statements is a good method. Let's take a look at this exercise;

1. Start Geany

1) Click "Application-programming-Geany" in the menu to start Geany and create a c ++ source program;

2) Click the "file-save as" command in the menu and save the file to your folder with "for" as the file name;

2. Enter the program code.

1) First, let's look at an integer code that shows up to 10;

For (int I = 0; I <10; I ++)

{

Cout <I <"";

}

2) There are three for statement brackets. The first sentence is to define a loop variable. The initial value is 0, and the middle sentence is a loop condition. When I is less than 10, execute the loop statement. The following content must be enclosed in braces,

The next sentence is the step size, I ++ is I = I + 1, plus one increment operation;

3) Save, compile, generate, and run the command, and display 10 records ranging from 0 to 9;

4) Because I starts from 0 and must be smaller than 10, it cannot be equal to, so the two ends are 0 and 9;

5) Okay. Enter another accumulate program, from 1 to 100 (1 + 2 + 3 +... + 100 );

Int sum = 0;

For (int I = 1; I <= 100; I ++)

{

Sum = sum + I;

}

Cout <"sum =" <sum;

6) This I <= 100, which can be added to 100. sum is the variable for storing and adding an I to it each time,

Sum = sum + I, this sentence is cumulative, Like stacked wooden boxes;

7) Save, translate, generate, and run, and the accumulated results are displayed;

# Include <iostream>

Using namespace std;

Int main (int argc, char ** argv)

{

For (int I = 0; I <10; I ++)

{

Cout <I <"";

}

Cout <endl;

Int sum = 0;

For (int I = 1; I <= 100; I ++)

{

Sum = sum + I;

}

Cout <"sum =" <sum;

Return 0;

}