C pass int array pointer as parameter into a function

Question

I want to pass the B int array pointer into func function and be able to change it from there and then view the changes in main function

#include <stdio.h>

int func(int *B[10]){

}

int main(void){

    int *B[10];

    func(&B);

    return 0;
}

the above code gives me some errors:

In function 'main':|
warning: passing argument 1 of 'func' from incompatible pointer type [enabled by default]|
note: expected 'int **' but argument is of type 'int * (*)[10]'|

EDIT: new code:

#include <stdio.h>

int func(int *B){
    *B[0] = 5;
}

int main(void){

    int B[10] = {NULL};
    printf("b[0] = %d\n\n", B[0]);
    func(B);
    printf("b[0] = %d\n\n", B[0]);

    return 0;
}

now i get these errors:

||In function 'func':|
|4|error: invalid type argument of unary '*' (have 'int')|
||In function 'main':|
|9|warning: initialization makes integer from pointer without a cast [enabled by default]|
|9|warning: (near initialization for 'B[0]') [enabled by default]|
||=== Build finished: 1 errors, 2 warnings ===|

Answer 1

In your new code,

int func(int *B){     *B[0] = 5; } 

B is a pointer to int, thus B[0] is an int, and you can't dereference an int. Just remove the *,

int func(int *B){     B[0] = 5; } 

and it works.

In the initialisation

int B[10] = {NULL}; 

you are initialising anint with a void* (NULL). Since there is a valid conversion from void* to int, that works, but it is not quite kosher, because the conversion is implementation defined, and usually indicates a mistake by the programmer, hence the compiler warns about it.

int B[10] = {0}; 

is the proper way to 0-initialise an int[10].

Answer 2

Maybe you were trying to do this?

#include <stdio.h>

int func(int * B){

    /* B + OFFSET = 5 () You are pointing to the same region as B[OFFSET] */
    *(B + 2) = 5;
}

int main(void) {

    int B[10];

    func(B);

    /* Let's say you edited only 2 and you want to show it. */
    printf("b[0] = %d\n\n", B[2]);

    return 0;
}

Answer 3

If you actually want to pass an array pointer, it's

#include <stdio.h>

void func(int (*B)[10]){   // ptr to array of 10 ints.
        (*B)[0] = 5;   // note, *B[0] means *(B[0])
         //B[0][0] = 5;  // same, but could be misleading here; see below.
}

int main(void){

        int B[10] = {0};   // not NULL, which is for pointers.
        printf("b[0] = %d\n\n", B[0]);
        func(&B);            // &B is ptr to arry of 10 ints.
        printf("b[0] = %d\n\n", B[0]);

        return 0;
}

But as mentioned in other answers, it's not that common to do this. Usually a pointer-to-array is passed only when you want to pass a 2d array, where it suddenly looks a lot clearer, as below. A 2D array is actually passed as a pointer to its first row.

void func( int B[5][10] )  // this func is actually the same as the one above! 
{
         B[0][0] = 5;
}

int main(void){
    int Ar2D[5][10];
    func(Ar2D);   // same as func( &Ar2D[0] )
}

The parameter of func may be declared as int B[5][10], int B[][10], int (*B)[10], all are equivalent as parameter types.

Addendum: you can return a pointer-to-array from a function, but the syntax to declare the function is very awkward, the [10] part of the type has to go after the parameter list:

int MyArr[5][10];
int MyRow[10];

int (*select_myarr_row( int i ))[10] { // yes, really
   return (i>=0 && i<5)? &MyArr[i] : &MyRow;
}

This is usually done as below, to avoid eyestrain:

typedef int (*pa10int)[10];

pa10int select_myarr_row( int i ) {
   return (i>=0 && i<5)? &MyArr[i] : &MyRow;
}