10.31 Daily

1031 Learning the three cyclic structures of daily newspapers 1031 Learning the three cyclic structures
of daily newspapers
Review
Branch structure
if structure

grammar

if (condition) { execute the content here when established }

// Two-way
if (condition) { execute the content here when established ; } else { execute the content here when the condition is not established; }

// Multi-way branch
if (condition) { execute the content here; } else if (condition n) { statement to be executed when condition n is established; } else { if the condition is not established, execute the content here; }

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switch structure

grammar

switch (variable) { case value 1: when the variable is equal to the value 1, execute the code here; break; case value n: when the variable is equal to the value n, execute the code here; break; default: when the variable is not equal to the above In case of all values, it will enter this branch; break; }

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while loop
Loop structure
Function

Repeat the implementation of some elements of
grammar

while (condition) { thing that needs to be repeated; }

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requirements

Print three star flowers
Syntax 2

while (condition) { if the condition is established, the content here will be executed; }

Will come here if the conditions are not met

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example

Output ordered numbers

int i = 0;
while (i < 6) {
System.out.println("!" + i);
i++;
}
System.out.println(“退出循环”);

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Flow chart

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Three elements of loop
condition variable

Conditional judgment

Make appropriate modifications to the condition variable in the loop

example

public class Draw {

public static void main(String[] args) {

    // 条件变量
    int i = 0;
    // 条件判断：决定循环能否进入，会对条件变量的数据进行判断
    while (i < 6) {
        System.out.println("!" + i);
        // 条件变量一定发生合适的变化
        i++;
    }
    System.out.println("退出循环");
}

}

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