3
votes
Accepted
Why is this program behaving unexpectedly?
The problem is with your scanf and the fact that you are telling it it will read an int but you give it a char. ASCII values may be represented by integers, but scanf can distinguish them. It checks ...
- 7,326
2
votes
Accepted
Using scanf to read into array
Per the manual page of scanf()
A sequence of white-space characters (space, tab, newline, etc.; see
isspace(3)). This directive matches any amount of white space,
including none, in the ...
- 17.4k
2
votes
Accepted
Question of inputing an array of char
First in the struct definition, you are the declaring a pointer to a char (char*), so if you don't want to use GetString(), when you try to store something that is not a pointer on any of this ...
- 1,359
2
votes
Accepted
Difference between scanf and get_int
As you will discover later on during the course, get_int() is part of the cs50 library "cs50.h" which is not used in the real world, except in the course. To ease the apprenticeship, David ...
- 63
1
vote
Accepted
Type int in scanf
When in doubt or you are sure you have done something correct but still receive errors, you should always check the the CS50 Man Pages to see what it says.
In this case, it says that scanf needs a ...
- 1,692
1
vote
dynamically allocated memory for a node is changed without any dereferencing?
You are printing tree->right the first time and
&tree->right) the second time. So those won't be the same, since the first is the address stored in your variable tree->right and the ...
- 18.3k
1
vote
pointers and scanf : when do I use &x, *x or just x?
I think you got it. scanf needs a memory address so it knows where to write to.
Whenever you add & you get the memory address of what follows. But in case of strings, what we pass as a string ...
- 20.7k
1
vote
Accepted
inputing multiple value(variable)
It can be done, and in fact, will be done as part of some of the last psets. But since this is a teaching environment, and one of the things this class teaches is how to find out how research ...
- 63.1k
1
vote
Accepted
How does printf and scanf works behind the scene?
The source code for the GNU C standard library implementation of vprintf (which is called by printf) should indicate that it is not a simple operation with a single answer, however, understanding ...
- 2,625
1
vote
Accepted
Reject empty/blank user input
Use GetInt() from the cs50 library!
GetInt(), as its name suggests, waits for an int input from the user and returns it.
You may use like that:
#include <cs50.h>
#include <stdio.h>
int ...
- 17.4k
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