A story that I finally understood Java for statement as a non-engineer

Preface

This is my first post, but I was happy to understand it, so I would like to share about the loop processing of Java's super-basic for statement.

Before I was 30 years old, I jumped into the IT industry from another genre of sales, It was good until I jumped in, but I was drowning, so I am studying again.

Well, the main subject at once.

public static void main(String[] args) {
	int sum = 0;
	for (int i = 1; i <= 10; i++) {
		sum += i;
		System.out.println(sum);
	}

}

this.

Ah, it's processed repeatedly from 1 to 10. That's a thin knowledge.

But I don't know what order they are working. So, I would like to introduce the flow for non-engineers.

First this part

public static void main(String[] args) {
		
		
}

It's like a signal to start when you write a Java program. {} It will do the processing inside the box.

So what makes sense

int sum = 0;
for (int i = 1; i <= 10; i++) {
	sum += i;
	System.out.println(sum);
		
}

It is no exaggeration to say only here.

And from here.

meaning

In a sense, I think programming languages are foreign languages, so I will roughly translate them into Japanese.

int sum = 0;

"The total value of integers is 0"

Conditional part of for

for (int i = 1; i <= 10; i++) {
}

It ’s like an idiom here for (Initialization; Repeat condition; Update process) { Content to repeat } It seems, but I'm not sure.

My current understanding is as follows. (The integer i is 1; if i is 10 or less, repeat; by the way, add 1 to each number)

Repeated content

sum += i;

Add i to the total value in order

System.out.println(sum);

This is a statement that you can put out on the console (total value);

Process up to this point in order

public static void main(String[] args) {
	int sum = 0;
	for (int i = 1; i <= 10; i++) {
		sum += i;
		System.out.println(sum);
	}

}

1st processing Total value is 0 Mr. i starts from 1 0 + 1 In other words, the total value is 1.

Second process The total value became 1 Mr. i increases by 1 so 2 1 + 2 In other words, the total value will be 3

3rd processing The total value became 3 Mr. i increases by 1, so 3 3 + 3 or 6

Repeat the process like this

On the console 1 3 6 10 15 21 28 36 45 55

It comes out like.

end.

We are looking forward to Masakari. I hope it helps you understand even a little.