return_ptr.c

#include <stdio.h>
#include <string.h>
#include <stdlib.h>

struct nameTag{
    char fname[20]; char lname[20];
};

struct nameTag * wrong_getname(void){
    struct nameTag newname;
    struct nameTag *p;
    printf("Please enter first name:");
    fgets(newname.fname, 20, stdin);
    newname.fname[strcspn(newname.fname, "\n")] = '\0';
    printf("Please enter last name:");
    fgets(newname.lname, 20, stdin);
    newname.lname[strcspn(newname.lname, "\n")] = '\0';
    p = &newname;
    return p;
}

// (*p).fname ======= p->fname
struct nameTag * right_getname(void){
    struct nameTag *p = (struct nameTag *)malloc(sizeof(struct nameTag));
    printf("Please enter first name:");
    fgets(p->fname, 20, stdin);
    p->fname[strcspn(p->fname, "\n")] = '\0';
    printf("Please enter last name:");
    fgets(p->lname, 20, stdin);
    p->lname[strcspn(p->lname, "\n")] = '\0';
    return p;
}

int main(int argv, char * argc){
    int i;
    struct nameTag * local_name_ptr[5];


    for(i = 0; i < 5; ++i)
        local_name_ptr[i] = wrong_getname();
    for(i = 0; i < 5; ++i)
        printf("i-index first name : %s, last name : %s\n", local_name_ptr[i]->fname, local_name_ptr[i]->lname);

    for(i = 0; i < 5; ++i)
        local_name_ptr[i] = right_getname();
    for(i = 0; i < 5; ++i)
        printf("i-index first name : %s, last name : %s\n", local_name_ptr[i]->fname, local_name_ptr[i]->lname);
    for(i = 0; i < 5; ++i)
        free((local_name_ptr[i]));
    
    return 0;
}