Question

How to connect one Struct to other Structs in C.

Suppose I have 7 structs:

struct file files[7];

Each of the structs has a unique name such as file1, file2, file3, file4, file5, file6, file7

What I need is in each of the structs store from 3 to 6 names of other structs, and if a struct is connected to one struct, that struct must also be connected to the same struct.

EXAMPLE:

A struct with name file1 stores name of file2, file3, file4, file5

So, all of those structs must also store the name file1 plus 2 to 5 names of other structs.

All coding must be done in C

Answer 1

struct File {
        struct File* files[7];
};

struct File* createFileStruct() {
        struct File* r = (struct File*) malloc(sizeof(struct File));
        for(int i=0; i<7; i++) {
                r->files[i] = NULL;
        }
        return r;
}

void connectStructure(struct File* src, struct File* dest) {

        // check if dest is already present in src, 
        // then no need to do anything.
        for(int i=0; i<7; i++) {
                if(src->files[i] == dest) {
                        return;
                }
        }

        // Now entry is not there, hence make an entry
        for(int i=0; i<7; i++) {
                if(src->files[i] == NULL) {
                        src->files[i] = dest;
                        break;
                }
        }

        // SIMILARLY, create an entry in destination also.
        for(int i=0; i<7; i++) {
                if(dest->files[i] == NULL) {
                        dest->files[i] = src;
                        break;
                }
        }
}

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