Pass a Record to a Function

The desk clerk prints kit labels from more than one record. Give the printing function a struct Kit parameter: it receives a copy, so reading its members leaves the caller's record alone.

#include <stdio.h>
struct Kit { const char *name; int pieces; };
void show_kit(struct Kit kit) {
    printf("%s: %d pieces\n", kit.name, kit.pieces);
}
int main(void) {
    struct Kit kit = {"Paint", 4};
    show_kit(kit);
    return 0;
}

Run it to see Paint: 4 pieces. Change the piece count in main and run again; show_kit prints the new value without needing its own hard-coded count.