Questions tagged [week3]

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18 views

why am i getting an “ use of undeclared identifier 'j' or 'i' ” on the vote and tabulate functions?

shouldn't the compiler consider the 'i' and the 'j' from the for loop in the 'main' function to be the voter and rank ints passed to the functions #include <cs50.h> #include <stdio.h&...
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1answer
44 views

Can you help me to understand why does the output of time function vary every time while applying it on same file with same sort type?

When I run for example (time ./sort1 random5000.txt) it gives me real, syst, and user time. But if I run the same command again it will gives me different time results! I can't understand why this ...
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1answer
13 views

when to search in binary search right, when left?

in the binary search algorithm: If no items Return false If middle item is 50 Return true Else if 50 < middle item Search left half Else if 50 > middle item Search right half like can we do the ...
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2answers
540 views

Error testing in plurality question

I already test my code with all possible input and it working fine but when I run with check50 cs50/problems/2020/x/plurality, I got a couple of error result :( print_winner identifies Bob as ...
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1answer
10 views

call stacks short vedio

in the call stacks short there is a code when doug explains that the function returns (1) i want to know how the c knows or the computer knows the difference between returning (1) mean the program ...
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2answers
13 views

Hexadecimal video unaccessible

The Hexadecimal video in Week 3 is not accessible.
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1answer
59 views

Find.c - Binary Search probable integer overflow

Here's the gist: https://gist.github.com/Securiteru/a83e4f1a028acd0b1013def793b5dcdc And the output: ... 60697 61151 61190 61275 61460 61608 61618 61746 61750 61822 62111 62178 62183 62311 62448 ...
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1answer
39 views

Concept of run time in lecture week 3

In week 3's lecture, David talked about the concept of runtime where the worst possible scenario for say insertion sort is O(n squared) and the best case scenario would be omega(n). I dont understand ...
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1answer
49 views

Week 3 Binary Search Video Short question

I just watched the short for binary search and I'm having trouble understanding how making a conditional of (max < min) would mean that the number is not in your array (timestamp 04:05). I get ...
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1answer
87 views

Pointers basic Concept with functions

http://cslibrary.stanford.edu/102/PointersAndMemory.pdf Reading this told us that when function gets called its locals gets called and when it exits its locals gets destroyed so that we can't use its ...
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1answer
30 views

week3 lecture very beginning

Week3 Lecture: A student asked a question of my mind how do computer know about the argc ? I really don't understand how is this argc working In case we printed "zymla" we gave argv[1] as our first ...
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1answer
106 views

vigenere ,, segmentation fault core dumped [duplicate]

the code compiles well ,, but an error ocures
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1answer
213 views

Initials ,, The Right output but not accepted

I have all outputs Right Desperate Help Yelling