学习qbasic并试图理解我刚写的代码 [英] Learning qbasic and im trying to understand the code I just wrote

问题描述

所以我遇到了一个问题，告诉我用星星打印一个三角形。



我最终猜测并检查并取出它。

So I had a problem on a hw assignment that told me to print a triangle out of stars.

I ended up guessing and checking and pulling out this.

DIM LINES AS INTEGER
CLS

INPUT "How many lines will your triangle be: ", LINES

FOR x = 1 TO LINES
    PRINT
    FOR y = 1 TO x
        PRINT "*";
    NEXT y
NEXT x
END

守则有效，但我不明白怎么做。我已经快速掌握了编程，但嵌套循环让我在大部分时间都感到困惑。我现在很难学习qbasic，但这就是我的学校提供​​的。有人可以解释我刚才写的代码。并帮助我DO和FOR命令。谢谢我，我的硬件非常好，所以我的老师没有帮助。



我尝试了什么：



我猜并检查了代码，现在我很困惑。我只是要求解释。尝试自我解释，但是，没有理解它。

The Code works but I dont understand how. I've picked up programming fast, but nested loops have left me confused most of the time. I now its weird to be learning qbasic but that is what my school offers. Can someone please explain the code I just wrote. And help me with DO, and FOR commands. Thank You I am really far ahead with the HW so my teacher isnt helping.

What I have tried:

I guess and checked the code and am now confused. An explanation is all im asking for. Tried to self explain but, didnt understand it.

推荐答案

我会在一张纸上开始，因为你只有3个变量，LINES，X，Y



我打算使用符号a< - b表示a的值变为b



LINES< - 5作为起点



X< - 1（满分5分）

Y< - 1 （超出X等于1）

打印*

第1行，打印一份*



X< - 2（满分5分）

Y< - 1（X中等于2）

打印*

Y< - 2（X中等于2）

打印*

第2行，两个*打印



X< - 3（满分5分）

Y< - 1（X中等于3）

打印*

Y< - 2（X中等于3）

打印*

Y< - 3（超出X等于3）

第3行，3*打印



所以对于我的情况5（线）中的每一行'X'，我将使用'Y'来打印该行上的星数 - 等于X星 - 第一行有1星，第二行有2星，第三行有3星，第4行有4星，第5行有5星



btw，在两个循环之间XY即

I would have started on a piece of paper, since you only have 3 variables, LINES, X, Y

I'm going to use a notation a <- b means that a becomes the value of b

LINES <- 5 as a start point

X <- 1 (out of 5)
Y <- 1 (out of X which equals 1)
Print "*"
Line 1, one "*" printed

X <- 2 (out of 5)
Y <- 1 (out of X which equals 2)
Print "*"
Y <- 2 (out of X which equals 2)
Print "*"
Line 2, two "*" printed

X <- 3 (out of 5)
Y <- 1 (out of X which equals 3)
Print "*"
Y <- 2 (out of X which equals 3)
Print "*"
Y <- 3 (out of X which equals 3)
Line 3, 3 "*" printed

So for every line 'X' in my case 5 (Lines), Im going to use 'Y' to print the number of stars on that line - which equals X stars - 1st line has 1 star, 2nd has 2 stars, 3rd line has 3 stars, 4th line has 4 stars, 5th line has 5 stars

btw, in between the two loops X Y ie

NEXT Y
NEXT X

我会做类似的事情

I would have done something like

NEXT Y
PRINT (something to make a new line)
NEXT X

但是自从我做了任何BASIC以来已经很长时间了，所以你必须要看一下



有帮助吗？









如果你缩进，它也更容易看到'循环' em $ / $

but its been a long time since Ive done any BASIC so you'll have to look that up

does that help ?




Its also easier to see 'loops' if you indent them

FOR X = 1 to LINES
    FOR Y = 1 to X
    
    NEXT Y
NEXT X

[/ EDIT]

[/EDIT]

我建​​议使用调试器，但我不记得它是否在QBasic中有效。

从Standord University试试这个链接：

学习编程 [ ^ ]

和这一个

https://www.khanacademy.org/computing/computer-programming/programming/l ooping / p / nested-for-loops [ ^ ]



根据需要搜索教程。

I would recommend to use the debugger, but I don't remember if it was efficient in QBasic.
Try this link from Standord University:
Learn to Program[^]
and this one
https://www.khanacademy.org/computing/computer-programming/programming/looping/p/nested-for-loops[^]

Search for tutorials as you need.

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