Initialize/reset struct to zero/null

Question

struct x {
    char a[10];
    char b[20];
    int i;
    char *c;
    char *d[10];
};

I am filling this struct and then using the values. On the n

Answer 1

I believe you can just assign the empty set ({}) to your variable.

struct x instance;

for(i = 0; i < n; i++) {
    instance = {};
    /* Do Calculations */
}