Questions tagged [function]
The function tag has no usage guidance.
70
questions
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where am i making mistake here? problem set2 substitution
hey here i am trying to return 0 if argument string contains all 26 alphabet characters
otherwise function should return 1 and print message]1 ]
- 1
0
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0
answers
14
views
Pset1/ cash without creating functions
Why should we create function, while we can do the same thing in a simpler method. the number checks worked correctly but when I tried check5o, it got me the yellow face.
Also I am so confused, when ...
0
votes
1
answer
59
views
PSET 2 Readability: undefined reference to `count_letters'
I'm receiving the error:
/usr/bin/ld: /tmp/readability-1786f7.o: in function main': /workspaces/109105972/readability/readability.c:19: undefined reference to count_letters'
clang: error: linker ...
0
votes
1
answer
38
views
Error when calling seconnd function - expected expression
I'm trying to call my encryption function and am getting an undeclared identifier error. Not sure where i'm going wrong.
Code:
#include <cs50.h>
#include <stdio.h>
#include <ctype.h>
...
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0
votes
1
answer
71
views
Function returns not working for CS50 readability.c
In CS50 we now have to make multiple functions (I guess they want us to get used to objective-oriented programming for the python part later) and return the value to the main function.
When I execute ...
0
votes
1
answer
93
views
PSET6 DNA Why is my (count consecutive substrings in string) function always returns 0's?
I tried writing different function variations but my count_dna function keeps returning zeroes (despite having consecutive sequences of STRs in the dna sequences)--can anyone please tell me why?
Note: ...
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0
votes
1
answer
208
views
error : function definition not allowed here pls help
i got this error message
pls help
$ make triangle
clang -ggdb3 -O0 -std=c11 -Wall -Werror -Wextra -Wno-sign-compare -Wno-unused-parameter -Wno-unused-variable -Wshadow triangle.c -lcrypt -lcs50 -...
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votes
3
answers
26
views
Error retrieving return values from a function
I am currently studying coding in C language and I have doubts about the return of functions, what I am trying to do is the following:
Call the number () function and pass 3 values of the integer ...
0
votes
2
answers
85
views
Lecture 2 Arrays
I tried using the code David show to average a set of scores in an array.
#include <stdio.h>
#include <cs50.h>
float average (void);
int main(void)
{
int n = get_int("Total ...
- 111
0
votes
2
answers
146
views
PSET5 Speller Load function skips the words from the dictionary
Struggling with the load function in speller for second week now. What I found using debug50 and placing "printf" between different lines of code is that the fscanf reads every second word ...
0
votes
1
answer
46
views
PSET2 Getting segmentation error
Hello so I am doing PSET 2 Caesar and I tried to write a function to tell me if argv[1] is not a integer I want it to print the error message from the assignment. The problem is I'm very new with ...
- 17
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1
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73
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Week 2 Lecture - Functions - Valid Triangle
This is from the functions lecture on a valid triangle. I'm not getting any error messages but I can't figure out why the
bool valid_triangle (float x, float y, float z)
function is not working. Any ...
0
votes
1
answer
12
views
when I compile my program this bug appear. error: control may reach end of non-void function [-Werror,-Wreturn-type] }
bool check_valid_key (string s)
{
for (int i = 0, len = strlen(s); i < len; i++)
{
if (!isdigit(s[1]))
return false;
return true;
}
}
1
vote
1
answer
43
views
pset 3 runoff help again
I still dont know what to put in for loop :(
I still dont know what to put in the for loop
for(int k = 0; k < voter_count; k++)
{
for (int j = 0; j < candidate_count; j++)
{
...
- 40
0
votes
1
answer
87
views
Pset2 Coleman-Lau Index Always Prints -15
I'm struggling with PSet 2 Readability. I don't want to cheat the answers because I am genuinely trying to learn how to think better and improve my logic.
I so far have been able to get the letter ...
- 103
0
votes
1
answer
34
views
Expected expression on "valid triangle" exercise? i thought the 'or' symbol was 2 lines ( || ) what have i done wrong here?
#include <stdio.h>
#include <cs50.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
// PROTOTYPE THE FUNCTON
bool valid_triangle(float input1, float input2, ...
- 34
0
votes
2
answers
33
views
Can anyone tell me what ive done wrong and breakdown how to properly prototype and deploy created functions?
code:
#include <stdio.h>
#include <cs50.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
// PROTOTYPE THE FUNCTONS & DECLARE VARIABLES
int multiply(int ,...
- 34
0
votes
1
answer
40
views
What's in the bool function parenthesis?
hope everyone is staying safe. I just want to understand what's inside the parenthesis of the vote function in pset3 - Tideman:
bool vote(int rank, string name, int ranks[])
What does it mean to ...
0
votes
1
answer
1k
views
too few arguments to function call, at least argument 'format' must be specified
I run the C program and I get the following errors.
4:20: error: too few arguments to function call, at least argument 'format' must be specified int x= get_int();
/usr/include/cs50.h:82:1: note: '...
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0
votes
1
answer
137
views
Question for Array in C (with function e.g. set_array)
While I was doing cs50 week2.
I found something hard to understand.
#include<stdio.h>
void set_array(int array[4]);
void set_int(int x);
int main(void)
{
int a = 10;
int b[4] = {0, 1,...
- 5
0
votes
1
answer
56
views
Speller seg faults in unload function
I've tried to fiddle around with my unload function for a while and don't understand why I'm getting a seg fault. It seems that the unload function is running through completely at least once, but ...
1
vote
1
answer
459
views
example positive.c explanation of function
1. // Abstraction and scope
2.
3. #include <cs50.h>
4. #include <stdio.h>
5.
6. int get_positive_int(string prompt);
7.
8. int main(void)
9. {
10. int ...
0
votes
1
answer
43
views
Define buy or selling function
I am working on pset8 everything is working I have found a snippet of my code which is identical for buying and selling only difference is to subtract or add to current cash.
Can someone point me in ...
- 107
0
votes
1
answer
10
views
Analysing Expected runtime
I came across a question to implement an unbiased random function which outputs 0 or 1 using a biased output function which outputs 0 or 1 with probability P for outputting 1. And to predict how the ...
0
votes
1
answer
176
views
PSET2 Vigenere: Control may reach end of non-void function error
I wrote a function to return the shift value for a certain character inputted. Where A, a = 0, B,b =1, etc.
int shift(char c)
{
int asc;
if (isupper(c))
{
asc = atoi(&c) - 65;...
0
votes
1
answer
47
views
About the functions
Why does this code not work?
I want to understand why I need to create copies of a and b.
I understood the whole idea, but the creating process is not clicking with me.
0
votes
1
answer
98
views
declaring a function
Im trying to declare a new function to use in vigenere, I want to create a function that will check if an entire string is alphabetical (not just a single character in a string which is what the ...
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1
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475
views
pow() function of a float
Why the pow function act like this?, shouldn't the computer consider any integer for example the number 3 as float like this 3.000etc? why it produce different results?
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1
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39
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PSET3- Game of fifteen, function move();
So, my move function is ALMOST working, but sometimes when swaping numbers both tile AND blank space shows up as a blank space...can you guys check my code? Thanks!
Ps..Blank is a global variable, ...
0
votes
2
answers
41
views
Give a Function access to earlier value
If the main block of code gets a value from the user, assigns it to an integer, and then changes that interger's value, is there a way for a function (created outside the main block of code) to access ...
0
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0
answers
947
views
speller.c:217:5: error: redefinition of 'main' int main
I actually received two error messages:
speller.c:217:5: error: redefinition of 'main'
int main(int argc, char *argv[])
^
speller.c:20:5: note: previous definition is here
int main(int argc, ...
1
vote
1
answer
73
views
Why do I get a wrong html file after executing a quote function? pset finance
I am implementing a quote function in application.py. But the result is ridiculous. After I enter a symbol to search for, I get an apology.html(saying Missing Username!), but this apology.html with ...
- 299
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votes
1
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26
views
Breakout / pause(function) slows the paddle
When I add pause(5) to the while loop, pause function makes the ball not zip around, it also seems to slow down the paddle responsiveness. What do I have to do to get around that?
I do understand why ...
- 299
0
votes
1
answer
56
views
Pset6 - Analyzer.py - Says Undeclared Function
I declared a function called load_words above init() to load in the words. However, when I call my function in init(), it gives the error name 'load_words' is undefined at the lines where I call ...
- 800
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votes
1
answer
27
views
PSET3:Find: Code works without the function, doesn't work with the function
So I am working on Selection Sort for Find, Problem Set 3.
When I use a function I made called swap to exchange the values, the array is not sorted. Function snippet:
if (min != i)
{
swap(values[...
0
votes
1
answer
72
views
What does "using" a variable entail and why does this inconsistency come up? (pset1, greedy, general question)
During the greedy problem in pset1 I wrote this function:
void greedy(int coin_type, int *change, int *coins) {
while (*change / coin_type > 0) {
*coins++;
*change -= coin_type;...
1
vote
2
answers
110
views
Pset4 recover.c compiles, but can't seem to print Jpgs at all
Am starting a new thread as I'm having trouble understanding what is wrong with the code.. I've added printf statements at the jpgCheck function and did not get a print. I suspect it's the function?
...
- 71
0
votes
2
answers
341
views
(PSET 1) Creating functions for water.c. Dont understand how this function worked. (Contains pset answer)
I'm doing water.c of pset1 and wanted to use functions to practice and understand it more. After getting so many errors, I finally got it to work but I don't understand why and how it worked. How is '...
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0
votes
1
answer
281
views
Why does this recursive factorial function hit segmentation fault?
This is the recursive function I'm using to calculate the factorial of an int. It compiles fine but when I run it, the program hits segmentation fault.
The function receives an int taken from the ...
0
votes
1
answer
66
views
PSet 3 - Game of fifteen - draw tile gives weird output
I have not been able to draw the board properly. Whenever i run the code
~/workspace/pset3/fifteen/ $ ./fifteen 4
WELCOME TO GAME OF FIFTEEN
15 14 13 12
11 0 0 4196528
0 0 -186283616 32766
48 -...
0
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1
answer
973
views
Use of functions and variable declarations outside main() on pset1 greedy
I have completed greedy from pset1 and I still doubts about the variable declarations and the function position.
What is the difference if they are declared inside or outside the main function?
#...
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0
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1
answer
70
views
CS50 pset 5 cannot load
I have been working on pset5 for a while. This compiles but load 0 words.
http://pastebin.com/Kncw3V8g
- 103
0
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1
answer
114
views
pset6 parse: char* pointers are right in parse but return wrong value
I am having trouble with this pset and I am using gdb to step through the function. Should I worry about the following observations or should I ignore them and assume my problems are from something ...
- 197
0
votes
1
answer
47
views
Why does PrintName return void?
Okay so in the PrintName function, it contains a printf function. However, I read that printf returns a value which is the number of characters. Shouldn't PrintName hence return an int as well? Thanks!...
- 103
0
votes
1
answer
530
views
Difference between Pass by Value and Pass by Reference (a practical example)
at the end of Doug's video on arrays he explains how variables get passed in function calls in comparison to how arrays work.
void set_array(int array[4]);
void set_int(int x);
int main (void)
{
...
- 21
0
votes
0
answers
141
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pset5-Testing load function separately2
I have been trying to test load function separately
(Using Zamyla video for some guidance).
I have watched this tape several times, but still unable to load function without compiler errors.
I am ...
- 99
0
votes
1
answer
510
views
pset5-testing load function
Ihave been trying to test my load function separately,since I have not implemented other functions,size,check,unload . I have got the following Clang error " expected identifier". I do not know how ...
- 99
0
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0
answers
100
views
pset5 load function mallocs more new then i expected, am i building the trie wrong?
With the answer and tips from Cliff B i've managed to stop segfaults and loosing data in the memory, but still unsure about trie implementation. Here's the current code:
bool load(const char* ...
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1
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22
views
How to end with an unsuccesful memory allocation?
when allocating memory, it is recommended to manually check whether the allocation was successful (or more accurately, terminate the program if it wasn't).
Main:
int main (void)
{
char *c = ...
- 58
0
votes
1
answer
26
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Pointers in a function
Can someone please explain, why list-printing cycle with pointers works perfectly fine from main(), but refuses to work from separate function when called.
#include <stdio.h>
void listPrint (...
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