Thread: Unable to access/modify desired pointer value after calling a library function

Thats a good example for using desciptive names for variables and defines.
Line 2:

Code:

    int i, j, k,m,n,M;

M is defined as an integer, but not inizialized.


Line 8+9:

Code:

    double v[M*M];
    double d[M];

v and d are defined as double vectors with a size of M, but M isn't initialized.
Nobody knows how big or small this vectors are.


Line 104+105:

Code:

#define M 3
    double Gyration[M*M] = {
…

M is now a define to represent 3.
And Gyration is a double vector in size of 9.
But have v and d the right size?


To fix this, set line 104 as the first line (in front of the function).
Delete the integer M on line 2.
To avoid confusion, rename M to SIZE_M. It makes it clear that this is a defined name.