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Returning array pointer produces "warning: return from incompatible pointer type"


Returning array pointer produces "warning: return from incompatible pointer type"

By : MsRaman
Date : November 22 2020, 10:33 AM
With these it helps The type of the object you are returning doesn't match the return type of the function:
code :
int * lineToXY(char line[]) { -----+   You've declared lineToXY to return a pointer to
  ...                              |   int, but you declare xypair as an array of
  static double xypair[2]; --------+   double; in the return statement, the expression
  ...                              |   xypair "decays" to an expression of type 
  return xypair; <-----------------+   double *, which is not int *, hence your warning
}
void lineToXY( char line[], size_t linesize, double xypair[] )
{
}
...
int main( void )
{
  char inputLine[SOME_SIZE];
  double pair[2];
  ...
  lineToXY( inputLine, sizeof inputList, pair );
  ...
}


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"Warning: assignment from incompatible pointer type" when using a double pointer

"Warning: assignment from incompatible pointer type" when using a double pointer


By : Boris Fortin Côté
Date : March 29 2020, 07:55 AM
This might help you files has type char (*)[128], not char**; there is no second level of pointer (and we're not talking about const yet; it's another can of worms).
This code should not show a warning (except the one for constness)
code :
const char files[][128]={"file1","file2","file3"};
char (*ptr)[128];

ptr=files;
C, pointer to function in struct, warning "assignment from incompatible pointer type"

C, pointer to function in struct, warning "assignment from incompatible pointer type"


By : Dmitrij
Date : March 29 2020, 07:55 AM
should help you out I have a struct defined as follow: , Here is your function, and the function-type required, side-by-side:
code :
void BHVR_line_follow(int *currstate)
char (*behave) (int*)
Warning in array of pointers "initialization from incompatible pointer type"

Warning in array of pointers "initialization from incompatible pointer type"


By : tim eldred
Date : March 29 2020, 07:55 AM
To fix the issue you can do ZeroA and so one are pointers to an array of char elements. &ZeroA holds the address of the pointer to the array ZeroA and so to hold it you need char **
The correct way to do it in your example is like this: char *XYZ[11]={ZeroA,OneA,TwoA,ThreeA,FourA,FiveA,SixA,SevenA,EightA,NineA,TenA};
C - "incompatible type" warning upon assigning array to pointer

C - "incompatible type" warning upon assigning array to pointer


By : peeush
Date : March 29 2020, 07:55 AM
it should still fix some issue There are multiple problems in your code:
p should be defined as const char **p to be compatible with const char *list[]. you could initialize the len1 and len2 variables to the computed lengths of the arrays to avoid potential discrepancies on larger sets. the tests on ran1 to select the set are both redundant and potentially incomplete. You should make sure all values of ran1 are covered and let the compiler know. A properly configured compiler with all warnings enabled will complain that p and pcount are potentially uninitialized. you should seed the random number generator just once in your program, otherwise multiple calls to test() occurring in the same second will choose the same word.
code :
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>

void test(void) {
    const char *list1[] = { "one", "two", "three" }; // first list
    int len1 = sizeof(list1) / sizeof(list1[0]);

    const char *list2[] = { "uno", "dos", "tres", "quatro" }; // second list
    int len2 = sizeof(list2) / sizeof(list2[0]);

    const char **p;            // variable to hold chosen list
    int pcount;                // size of the chosen list
    char word[64];             // chosen word

    int ran1 = rand() % 2;     // random number 0 or 1

    if (ran1 == 0) {
        p = list1; pcount = len1;
    } else {
        p = list2; pcount = len2;
    }

    strcpy(word, p[rand() % pcount]);
    printf("The word is %s.\n", word);
}

int main() {
    srand(time(NULL));  // seed the random number generator.

    test();
    test();
    test();
    test();
    return 0;
}
C "warning: initialization from incompatible pointer type" when function has an array as an argument

C "warning: initialization from incompatible pointer type" when function has an array as an argument


By : Teemu Joensuu
Date : March 29 2020, 07:55 AM
Any of those help The function type you are trying to declare as the target of the element type of your array has as its third parameter a 2D, variable-length array of const int. In your array declaration, however, you try to declare it as a single const int. These are not compatible.
The clearest way to declare it would be like this:
code :
void(*p[1])(int, int, const int[*][*]) = { min };
void(*p[1])(int, int, const int[][*]) = { min };
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