I am a first year student, because of this pandemic the way of learning is through online class but I’ve been struggling comprehending the c programming of how our professor teach it to us. I get really overwhelm of everything he teaches, because I don’t know a thing in programming.. watching your videos helps me understand little by little, I hope someday I can relate to what our professor is discussing.
i gave myself this example: 13 % 3 is 1, because if all the 3 in 13 get eaten there will be 1 left there is four "3" inside 13 1 is extra and it remains or 1 doesn't count as 3 so it remains
Actually there is a modulus operator in C instead of using % sysmbol Modulus is defined in stdlib.h file and the syntax goes like this: 1) define the result like so: div_t result; /* Make sure #include is in the header */ 2) Then define your variables: int x = 45; int y = 4; result = div(x, y); 3) Now print your results like so: printf("%4d DIV %d = %d ", x, y, result.quot); printf("%4d MOD %d = %d
I just found out that the % operator in C isn't a modulo operator the hard way. I was writing a ceasar cipher program for fun and predefined in arrays what characters should be actually ciphered. So to put the right character into the output file according to the chosen key variable k, I fputc (arr[ (i - k) % 26], fp) and logically in my head everything should work fine. I took my calculator and checked quickly if this would behave mathematically like I expect and sure enough as long as the (i - k) part is calculated before the % operation negative numbers would result in the desired index number of the array, except it doesn't, because % is actually not a modulo operator in C it is the remainder operator. You might now say but isn't that the same and the answer is no. It took me literally hours to finally realize this. I was getting all kind of weird outputs and I checked every step of the code multiple times and I couldn't find the bug until I tested this stupid % operator more in depth. It doesn't like negative numbers it can't properly compute them. This is how I got to this video. Reading the C99 definition of the % operator finally confirmed my suspicion. Now I have to rewrite my code to handle this completely unexpected weirdness. Long story short, today I learned that the % operator is actually not a modulo but a remainder operator. The more you know xD
I think the best way to describe it in C Programming is as a remainder. 5%2 = 5 - 2*truncate(5/2) = 5 - 2*2 = 1. Gets a bit weird with negative numbers though.
So in C, mod isn’t fractional? In Desmos, if you plot y=mod(ax,b) you get a sawtooth with slope of a and period of b/a, and y has range [0,b) Is there a library or built-in function that allows fractional modulus?
What I don't know if I understand is having a number like 25 being divided by 2, which gives you 12.5. Why does it give me 1 and not 12? I know I'm probably being dumb but I need help clearing this up.
well.. time is way more valuable than things but sometimes we don't appreciate time more than things hahah why am i commenting things like this in a programming video but anw tysm for your tutorials i'm learning c as a fresh college student, not knowing anything about c language and came across to your channel which i never regret. tysm (should i call you) sir caleb, bless you!
@@codebreakthrough HAHAH never imagined getting a reply from you! Such an honor🙏🏼 I've been learning through your videos these past days and they're sooo easy to understand and for me it's one of the best channels at teaching programming languages. Stay inspiring Caleb, i aspire you!
10 doesn't go into 9 once, so the entire thing is the remainder. Think of it like division: 9 divided by 10. You'll be left with 9/10 or 0.9. Since it isn't greater than or equal to 1, 0.9 itself is the remainder.
@@samadhistate9637 Remember what I originally pointed out. 9 isn't greater than 16, so 16 can't be divided out of 9 (ie 16 is divided out 0 times). Thus the remainder is the original (9).
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After the words of wisdom...I'm 39, starting c for scratch. It's never too late.
I hope you're still doing it sir! I couldn't afford college but yes it's always never too late!
34 here :)
35!
Going back to university at 40 for a career change. I feel this.
career change at 43! this has been awesome
I am a first year student, because of this pandemic the way of learning is through online class but I’ve been struggling comprehending the c programming of how our professor teach it to us. I get really overwhelm of everything he teaches, because I don’t know a thing in programming.. watching your videos helps me understand little by little, I hope someday I can relate to what our professor is discussing.
Me too btw where r u from?
Did you👀
The pet rat pizza example is so golden!
i gave myself this example: 13 % 3 is 1, because if all the 3 in 13 get eaten there will be 1 left
there is four "3" inside 13
1 is extra and it remains
or 1 doesn't count as 3 so it remains
Straight to the point with great visual explanations and a fun attitude.
Fantastic tutorial Caleb, keep it up!
On a clock with 2 hours, it ends up at 1 O'clock if 5 hours pass is how I remember what 5%2 means
My God you are a savior!!!
😉👍🏻
The pizza was a good example, however im hungry now
Thankyou I haven't understood this for months and your pizza analogy really helped :)
If naay wmsu comsci nag tanaw ani ayaw kabalaka i explain ra nako unya sa school
well you do good videos they help alot
and i want to be a reverse engineer so yeah im still there learning C lol
but with your videos ill learn Fast
Modulus? More like modu-yay for us, because we’ve got such a great teacher. Thanks again for all of these wonderful videos!
I enjoyed your video :) Keep it up!
Actually there is a modulus operator in C instead of using % sysmbol Modulus is defined in stdlib.h file and the syntax goes like this:
1) define the result like so:
div_t result; /* Make sure #include is in the header */
2) Then define your variables:
int x = 45; int y = 4;
result = div(x, y);
3) Now print your results like so:
printf("%4d DIV %d = %d
", x, y, result.quot);
printf("%4d MOD %d = %d
", x, y, result.rem);
This should work just fine.
I loved it! And your comparison with pizza was a life savior for me. Thanks!!!
"My illustrations are weird and awful sometimes" - says it after making us understand the concept by taking a simple real life example of pizza.
i love you caleb curry great work..this series is awesome
Great video and very easy to understand!
Great educational video series, keep up the good work!
Sharing your pizza with your pet rat, imagine that :D great content, very clear videos.
You're making my journey of learning to code really fun !!! Thanks a lot for that.
I laugh so hard when I watch your videos !!!
Thank you! I understand now what and how modulus operator is and works.
i guess this is what haha sounds like when someone texts it
I just found out that the % operator in C isn't a modulo operator the hard way. I was writing a ceasar cipher program for fun and predefined in arrays what characters should be actually ciphered. So to put the right character into the output file according to the chosen key variable k, I
fputc (arr[ (i - k) % 26], fp)
and logically in my head everything should work fine. I took my calculator and checked quickly if this would behave mathematically like I expect and sure enough as long as the (i - k) part is calculated before the % operation negative numbers would result in the desired index number of the array, except it doesn't, because % is actually not a modulo operator in C it is the remainder operator. You might now say but isn't that the same and the answer is no. It took me literally hours to finally realize this. I was getting all kind of weird outputs and I checked every step of the code multiple times and I couldn't find the bug until I tested this stupid % operator more in depth. It doesn't like negative numbers it can't properly compute them. This is how I got to this video. Reading the C99 definition of the % operator finally confirmed my suspicion. Now I have to rewrite my code to handle this completely unexpected weirdness.
Long story short, today I learned that the % operator is actually not a modulo but a remainder operator. The more you know xD
Thank you. How we can translate this calculation to a math formula?
I think the best way to describe it in C Programming is as a remainder. 5%2 = 5 - 2*truncate(5/2) = 5 - 2*2 = 1. Gets a bit weird with negative numbers though.
So in C, mod isn’t fractional?
In Desmos, if you plot
y=mod(ax,b)
you get a sawtooth with slope of a and period of b/a, and y has range [0,b)
Is there a library or built-in function that allows fractional modulus?
if i apply the modulus operator between 4 and 8 the remainder would be 0.5, but when I run the program the answer is 4, What is wrong with fractions?
Modulus tells u the rest so 4%8 is 0 and the rest is 4
I like your illustrations too bro, dont worry
What I don't know if I understand is having a number like 25 being divided by 2, which gives you 12.5. Why does it give me 1 and not 12? I know I'm probably being dumb but I need help clearing this up.
How to write a program that displays which numbers between 1 to 500, are divisible by a number an user inputs?
well.. time is way more valuable than things but sometimes we don't appreciate time more than things hahah why am i commenting things like this in a programming video but anw tysm for your tutorials i'm learning c as a fresh college student, not knowing anything about c language and came across to your channel which i never regret. tysm (should i call you) sir caleb, bless you!
These vids help inspire deep thoughts. It’s ok ♥️
@@codebreakthrough HAHAH never imagined getting a reply from you! Such an honor🙏🏼 I've been learning through your videos these past days and they're sooo easy to understand and for me it's one of the best channels at teaching programming languages. Stay inspiring Caleb, i aspire you!
your illustrations are not weird, thanks for the pizzaaa
ez, just eat the remaining pizza without Pepper Jack knowing
my teacher said to use %d for integers. do you know why? why are you using %i
Can I use modulus function with type long in c ??
Yo' IDE too dark can't see clearly
A. I am totally enjoying your c videos
I want the modulus where the first number is smaller than the second number
Can someone please explain what a modulator sign is? I'm so confused on how to work out a modulus operation
I think that the percent sign % is commonly used to denote modular operations. Sometimes the word “mod” or “modulo” is used instead.
But beware the % sign isn't actually a proper modulus operator in C, I learned this the hard way today, after bug tracking my code for over 3 hours.
Also do for us when the numerator is less than the denominator
why did you put the "i" after %
what software do you use?
very helpful, thank u!
0:15 that Beavis and Butthead laugh :D
thank you !
So a integer of pizza is a piece...
!! that must make a float of pizza be the slice.
or c) I am a college student with a horrible profesor for programming and you are my only hope
Hey Caleb I wanted to ask sumthing.... What if I were to enter
" 55.5 %10" what result will I get.
5.5
b) I'm a total geek and already know most of this stuff so I'm watching it at 1.5x speed
why is 9%10 = 9?
i can't wrap my head around this..lol
btw nice video :)!
10 doesn't go into 9 once, so the entire thing is the remainder. Think of it like division: 9 divided by 10. You'll be left with 9/10 or 0.9. Since it isn't greater than or equal to 1, 0.9 itself is the remainder.
@@shakefl then why is 9 % 16 = 9? shouldn't it be 5625 (ie. 9/16 = 0.5625)
@@samadhistate9637 Remember what I originally pointed out. 9 isn't greater than 16, so 16 can't be divided out of 9 (ie 16 is divided out 0 times). Thus the remainder is the original (9).
@@samadhistate9637 9 is the remainder itself dingooo
What is 2%5 ???
thanks, helped a lot
wise words, about time, agreed.
Thank you a lot!
what about the remainder of floating numbers
They float off into the void, never to be seen again.
#include
int main() {
int input=0;
int output;
printf("enter the number to find a factor of");
scanf("%d",&input);
for(int i=0;i
Can you teach c+ and c++?
and D?
@@min-juiyeh664 and D++
love you man
i love your vids thank you
great video
Well done
thanks
Good video
Jajakallahu khiran
Is this an arithmetic and assignment operator? REPLY TO COMMENTS!!! LOL
Sorry its arithmetic i didnt pay attention lol thx
THANK CHU
The Best
died 0:45
Your a funny dude ;)
Am I the only one who got annoyed by the way he talks?
🙋
@@codebreakthrough You yourself huh, that was a smart answer :D
Thank you!
thanks
Thank you!