Counting to 200 than back to zero

sokin

Hello, this code can count to 200, however, i need to modify it to count to 200 and then back to zero. I just can't seem to figure it out.


int main() // main function
{
for(int n = 0; n <= 200; n = n + 5) //...Count to 200
{
print("n = %d\n", n); // Display name & value of n
pause(500); // 0.5 s between reps
}
}

Mike Green

You need to look in your C reference in the description of the for statement for examples of how you'd count backwards. Look at how the for statement is translated into a loop.

sokin

I understand how to count backward. It's just I don't understand how to count to 200 then reverse that and count to zero.

tomcrawford

Two loops. First one counts 0..200, second one counts 200..0.

Mike Green

Can you post the actual wording of the homework assignment? What is the goal? Is the loop supposed to count to 200 then back to 0 or are the printed values supposed to go to 200 and back to 0?

sokin

Yes so this is what I have and I keep getting an error. I am clearly missing something I just don't know what. I am three weeks into learning this program so it's hard for me to know where each statement should be.

int main() // main function
{
for(int n = 0; n <= 200; n = n + 5) //Count to 200
{
print("n = %d\n", n); // Display name & value of n
pause(500); // 0.5 s between reps
}
for(int n = 200; n >= 0; n = n + 10) //Count to 0
{
print("n = %d\n", n); // Display name & value of n
pause(500); // 0.5 s between reps
}

}

twm47099

In your second loop, what would be the value of n the second time? What needs to change to make n get smaller each time?

tom

sokin

Would it be putting a minus sign instead of a plus in the second loop? I just tried that and get an error saying,


error: 'n' undeclared (first use in this function)
count to 200 by 5s.c:18:8: note: each undeclared identifier is reported only once for each function it appears in
Done. Build Failed!

sokin

The actual wording is "Modify your program so that it counts up to 200 in steps of 5, then down to 0 in steps of 10".

sokin

I was able to figure it out using the while functions.

Thanks for all the feed back

Hal Albach

Did you forget to include simpletools.h?

#include "simpletools.h"

Your code worked fine for me when I added the #include... and changed the + 10 to -10