Change complex array element in C - c

Question

I'm trying to change a value of an element of a complex matrix in c.
After trying to do, the printed result of the element is 0, any idea on how to fix this?
Here is my code, thanks in advance.
int main()
{
int size = 2;
double _Complex **x;
double _Complex v;
//Creating complex matrix
x = (double _Complex **)malloc( size* sizeof(double _Complex *) );
x[0] = (double _Complex *)malloc( (int)(size*size)* sizeof(double _Complex ));
for(int i = 1; i < size; i++ )
x[i] = x[0] + (unsigned long)size * i;
//Printing the matrix
printf("Before \n");
for (int h = 0; h < size; h++)
{
for (int w = 0; w < size; w++)
{
v = x[h][w];
printf( "%d + i* %d ,", creal(v), cimag(v));
}
printf("\n");
}
//Changing the value
int _Complex t = 1 + 5*_Complex_I;
x[0][0] = t;
//Print the matrix after the change
return 0;
}

Answer 1

After trying to do, the printed result of the element is 0, any idea on how to fix this?
Wrong format specifier
double _Complex v;
...
// printf("%d + i* %d ,", creal(v), cimag(v));
printf("%g + i* %g ,", creal(v), cimag(v));
Save time, enable all compiler warnings.
warning: format '%d' expects argument of type 'int', but argument 3 has type 'double' [-Wformat=]
Complex int types
Such types int _Complex may cause warning: ISO C does not support complex integer types [-Wpedantic]. Recommend double _Complex.
// int _Complex t = 1 + 5*_Complex_I;
double _Complex t = 1 + 5*_Complex_I;
Uninitialized data
When printing, the complex values have not been assigned. Perhaps zero them with calloc(). Cast not needed in C. Perform multiplication using size_t math. Better to take the size of the de-reference pointer, than the type - easier to code right, review and maintain.
// x[0] = (double _Complex *)malloc( (int)(size*size)* sizeof(double _Complex ));
x[0] = calloc( (size_t) size * size, sizeof x[0][0]);