Question

@phi Can you help me with C Programming?

Answer 1

Make a flowchart for a program that draws a square with side length 200 pixels. Your program must use a while loop. Afterward, implement your algorithm in a C program.

Answer 2

how far did you get ?

Answer 3

turtle_init(600,600);
int angle=0;

while(angle<=90);
{
turtle_forward(200);
turtle_left(90);
angle ++;
}

Answer 4

I am not so sure about my while loop part.

Answer 5

#include "turtle.h"

int main(void)
{
turtle_init(600,600);
int angle=0;

while(angle<=90)
{
turtle_forward(200);
turtle_turn_left(90);
angle ++;
}

turtle_save_bmp("square.bmp");
turtle_cleanup();

return 0;
}

Answer 6

ok, so your idea is to start at 600,600 and move forward 200

(does that draw a line or does that just move ? we want to draw a line)

also, what direction are we facing? do we have to say ?

Answer 7

I complied using clang and ran it with `open square.bmp` and got this:

Answer 8

ok, but you should test
while (angle < 4) instead of
while(angle<=90)
what do you get ?

Answer 9

i am checking it out now

Answer 10

it shows the same drawing.

why is angle < 4 better than angle<=90?

Answer 11

"angle" is not a good name for the variable. "side" would make more sense.
each time you "go through the loop" you draw one line (side)

the last statement in the loop
angle ++
changes angle from 0 to 1 (the first time)
and then 2
and then 3
after that, you keep drawing until you have done 91 sides
(i.e. with angle <= 90 you are going around the square 91 times)

Answer 12

oh that makes sense. sorry i got mixed up with my variable

Answer 13

if you wanted to count "angle"
then you want to only go 360 degrees
and instead of
angle ++
you would write
angle += 90 (add 90 degrees each time you turn)
and then do
while (angle < 360)

Answer 14

Can you help me with another question @phi ?