Questions tagged [define]
The define tag has no usage guidance.
6 questions
1
vote
1
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What is the usage of creating DICTIONARY_H in pset5?
I cann't understand when to use the preprocessor directives as (ifndef, define ,etc.)? In dictionary.h, what is the importance of writing those statements? and regarding the reason that was mentioned ...
- 35
0
votes
1
answer
88
views
Why is const used in field.c of pset3?
What does the following code do in the find.c source code in pset3
const int MAX = 65536;
Does it define a constant MAX with value 65536?
If so, then is this same as writing : #Define MAX 65536
- 25
0
votes
2
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161
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Whats's difference between declaring and defining variables?
According to lectures all variables we use are declared as
int x = something;
or
int x;
But in pset3..in files that Cs50 staff made,they have done;
#define DIM_MIN 3 and #define DIM_MAX 9
So ...
- 5
0
votes
2
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3k
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Excess elements in scalar initilizer?
#include <cs50.h>
#include <stdio.h>
int example[];
int main(void)
{
int example = {1,2,3};
for (int i = 0; i < 3; i++) {
printf("%i \n", example[i]);
}
}
Why ...
- 3
0
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2
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588
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Declaration and Initialization gives error: unused variable
I am working on caesar's cipher and I am not done yet but below is my work in progress. I had done something similar and it was working all I needed to do is write some code to get it to wrap around ...
3
votes
2
answers
4k
views
Why do macros take more space than an equivalently defined function?
From Programming in C (3rd edition), page 309
Because macros are directly substituted into the program by the
preprocessor, they inevitably use more memory space than an
equivalently defined ...
- 17.7k