In C returned error: -1073741819 (0xC0000005) - c

Question

I program in C and I am testing my program and I don't understand why I get the error -1073741819 (0xC0000005). Here is the Code:
#include <stdio.h>
#include <stdlib.h>
double interpol(double x0, double y0, double x1, double y1, double h) {
double ergebnis = (y1 - y0) / (x1 - x0) * h;
printf("%.2f\n", ergebnis);
return ergebnis;
}
void interpol_array(double *x_org, double *y_org, int dim_org,
double *x_int, double *y_int, int dim_int,
int n) {
int j, i;
double h;
i = 0;
y_org[0] = y_int[0];
for (j = 1; j < dim_int; j++) {
if (j % (n + 1) == 0 && j != 0) {
i++;
x_int[j] = x_org[i];
y_int[j] = x_org[i];
continue;
}
printf("%.2f ", y_org[0]);
}
}
int main() {
/* Pointer erzeugen auf null setzen */
double *xArrayOriginal = NULL;
double *yArrayOriginal = NULL;
double *xArrayInterpol = NULL;
double *yArrayInterpol = NULL;
/**/
int dimOriginal = 2;
int n = 3;
int dimInterpol = (n + 1) * (dimOriginal + 1) - n; /*+1 wegen der null*/
int i, j;
double h;
/* Array für die Originalwerte erzeugen */
xArrayOriginal = (double *)malloc(dimOriginal * sizeof(double));
yArrayOriginal = (double *)malloc(dimOriginal * sizeof(double));
/*Array für das Interpolierte Array erzeugen*/
xArrayInterpol = (double *)malloc(dimInterpol * sizeof(double));
yArrayInterpol = (double *)malloc(dimInterpol * sizeof(double));
xArrayOriginal[0] = 0;
xArrayOriginal[1] = 1;
xArrayOriginal[2] = 2;
yArrayOriginal[0] = 2;
yArrayOriginal[1] = 4;
yArrayOriginal[2] = 8;
interpol_array(xArrayOriginal, yArrayOriginal, dimOriginal, xArrayInterpol,
yArrayInterpol, dimInterpol, n);
return 0;
}
In my program I have 4 dynamic arrays. 2 dynamic arrays for origin x and y values and 2 dynamic arrays for interpolated x and y values. I don't program the full interpolation because I got an error. Therefore I searched the error and found out that when I use
printf("%.2f ", y_org[0]);
I get the error that you can see above. Only when I change it to
printf("test");
it works fine. So why do I get this error. what is wrong with my array list?

Answer 1

In the function main, the lines
int dimOriginal = 2;
...
xArrayOriginal =(double *)malloc(dimOriginal*sizeof(double));
yArrayOriginal =(double *)malloc(dimOriginal*sizeof(double));
allocate arrays for 2 double elements each. However, the lines
xArrayOriginal[2] =2;
...
yArrayOriginal[2] =8;
write out of bounds of these arrays, as the only valid elements numbers are 0 and 1. This causes undefined behavior.
Also, in the function interpol_array, the following line causes undefined behavior:
y_org[0] = y_int[0];
This is because y_int has been assigned the value of yArrayInterpol in main, but the contents of yArrayInterpol has not been initialized.