Expanding Static Arrays in C

Question

Is it possible to extend a static array in C?

I tried creating a function which allocates a new dynamic array, copies contents to it and returns it's pointer; but It didn't work correctly, I'm getting debug error everytime.

I need to do something like this;

int a1[5] = { 1,2,5,4,1 };
extend(a1); //or  a1* = extend(a1);
.
.
.
a1[9] = 2;

My extend function so far;

int extend(int x[], int oldSize, int newSize) {
    int *extendedX = (int*)calloc(newSize, sizeof(int));

    int i = 0;
    for (; i < oldSize;i++) {
        extendedX[i] = x[i];
    }

    for (; i < newSize; i++) {
        extendedX[i] = 0;
    }

    return *extendedX;
}

Answer 1

You can't extend static array.

you can do it like this:

#include <stdio.h>

int *extends(int ar[],int oldsz,int newsz){
    int *newAr = malloc(newsz*sizeof(int));
    for(int i = 0; i < oldsz;i++){
        newAr[i] = ar[i];
    }
    return newAr;
}
int main(void) {
    int i,a[5] = { 1, 2, 3, 4, 5};
    int *a1 = extends(a,5,10);
    a1[5] = 6;
    a1[6] = 7;
    a1[7] = 8;
    a1[8] = 9;
    a1[9] = 10;
    a1[10] = 11;
    a1[11] = 12;
    for(i = 0; i < 12; i++)printf("%d ",a1[i]);
    return 0;
}