Question

Here is my struct;

typedef struct _values {
int contents[MAX_CONTENTS];
    ... more ints;
} values;

In another function, I initialize this particular array with;

int contents[MAX_CONTENTS] = {0};

for (i = 0; i < MAX_CONTENTS; i++) {
    v.contents[i] = contents[i];
}

And in my main I have this;

values v;
newValues (v);

I am getting the error whenever I try to modify an element in main like this;

v.contents[30] = 3;

This is the only error I am getting. What am I doing wrong?

Answer 1

v (and contents inside of it) may be getting passed by value. Change the prototype of your function to this:

void newValues(values *v);

Change how you’re calling it to this:

newValues(&v);

And rather than:

v.contents[i] = /* ... */;

Use:

v->contents[i] = /* ... */;