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C modulo operator behaving unusually with randomly generated integer in my code


By : pepe.carvalho
Date : September 11 2020, 07:00 AM
help you fix your problem 6327 % 40 is 7. If the screen has 23 in the position of the 7 from a previous print, printing "x mod 40: 7" will appear to have printed "x mod 40: 73".
Try something along the lines of one of these alternatives:
code :
printf("x mod 40: %02d \n", mod_x);
printf("[x mod 40: %d]\n", mod_x);


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Testing oddity of an integer with the modulo operator


By : Jakub Trzebiatowski
Date : March 29 2020, 07:55 AM
I hope this helps you . Might be because (i % 2) != 0 works for both positive and negative numbers

Inputs behaving unusually?


By : Randy Milton
Date : March 29 2020, 07:55 AM
To fix this issue The padding on the textarea and the input are different by default (user-agent stylesheet) and you haven't given a reset value for them. Try setting padding:0; on both of them, it should work.
Why did it work when you tried box-sizing:border-box; as @MLeFevre told you, you ask? Because what this property does is make the padding count as width and not as an addition of it (which is the normal browser behaviour we've had till CSS3). It does the same with border width too. So, it didn't matter the default padding wasn't zero because the width would be 100% no matter what padding you set.

Hyperlinks behaving unusually


By : Pablo Medina Díaz
Date : March 29 2020, 07:55 AM

Combination of macros behaving unusually


By : user2385659
Date : March 29 2020, 07:55 AM
around this issue Following the advice of Reese's Understanding and Using C Pointers, I defined a 'safe free' combination of function and macro, as follows: , I created this compilable code from your question:
code :
#include <assert.h>
#include <stdlib.h>

typedef struct S
{
    int *arr;
} S;

#define safeFree(p) saferFree((void *) & (p))

extern S *allocate(void);
extern void saferFree(void **p);
extern void deallocate(S **s_ptr);
extern void deallocate2(S **s_ptr);
extern void function(void);

void saferFree(void **pp)
{
    if (pp != NULL && *pp != NULL)
    {
        free(*pp);
        *pp = NULL;
    }
}

#define Fn_apply(type, fn, ...) {    \
        void *stopper_for_apply = (int[]){0};    \
        type **list_for_apply = (type *[]){__VA_ARGS__, stopper_for_apply};    \
        for (int i = 0; list_for_apply[i] != stopper_for_apply; i++) {    \
            fn(list_for_apply[i]);    \
        } }

void deallocate(S **s_ptr)
{
    safeFree((*s_ptr)->arr); // deallocates the array
    safeFree(*s_ptr); // deallocates the struct
}

void function(void)
{
    S *foo = allocate(); // allocates a new struct, makes the internal array as well
    deallocate(&foo);
    assert(!foo);
}

void deallocate2(S **s_ptr)
{
    Fn_apply(void, safeFree, (*s_ptr)->arr, *s_ptr);
}
typedef struct S
{
    int *arr;
} S;


extern S *allocate(void);
extern void saferFree(void **p);
extern void deallocate(S **s_ptr);
extern void deallocate2(S **s_ptr);
extern void function(void);

void saferFree(void **pp)
{
    if (pp != ((void *)0) && *pp != ((void *)0))
    {
        free(*pp);
        *pp = ((void *)0);
    }
}

# 33 "fz.c"
void deallocate(S **s_ptr)
{
    saferFree((void *) &((*s_ptr)->arr));
    saferFree((void *) &(*s_ptr));
}

void function(void)
{
    S *foo = allocate();
    deallocate(&foo);
    (__builtin_expect(!(!foo), 0) ? __assert_rtn(__func__, "fz.c", 43, "!foo") : (void)0);
}

void deallocate2(S **s_ptr)
{
    {
        void *stopper_for_apply = (int[]){0};
        void **list_for_apply = (void *[]){
            (*s_ptr)->arr, *s_ptr, stopper_for_apply
        };
        for (int i = 0; list_for_apply[i] != stopper_for_apply; i++)
        {
            saferFree((void *) &(list_for_apply[i]));
        }
    }
}

How can I increment and decrement an integer with the modulo operator


By : Sarah
Date : March 29 2020, 07:55 AM
hop of those help? I am trying to increment an integer based on a click. How the click happens does not matter so I'll stick to the logic. I am doing this in Java but the logic should be the same all around.
code :
(index + arraySize - 1) % arraySize
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