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bad5.c
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bad5.c
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct person
{
char *first_name;
char *last_name;
int age;
struct person *spouse;
};
void marry(struct person *p1, struct person *p2)
{
static char *music[] = { "Godländsk sommarnatt på trumpet", "Tannenbaum på pianola", "Sked" };
printf("\n%s...\n", music[rand() % 3]);
p1->last_name = p2->last_name;
p1->spouse = p2;
p2->spouse = p1;
}
void free_person(struct person *p)
{
free(p->first_name);
free(p->last_name);
free_person(p->spouse);
}
void print_person(struct person *p)
{
printf("%s, %s is %d years old", p->last_name, p->first_name, p->age);
if (p->spouse)
{
printf(" and married to %s (age %d).", p->spouse->first_name, p->spouse->age);
}
printf("\n");
}
int main(int argc, char *argv[])
{
if (argc < 7)
{
printf("Usage: ./%s first1 last1 age1 first2 last2 age2", argv[0]);
}
else
{
// Allocate memory for one person
struct person *p1 = malloc(sizeof(struct person)); // Don't change this line
// Construct p1 from the command line arguments
*p1 = (struct person) {
.first_name = strdup(argv[1]), // Don't change this line
.last_name = strdup(argv[2]), // Don't change this line
.age = atoi(argv[3])
};
struct person *p2 = malloc(sizeof(struct person)); // Don't change this line
*p2 = (struct person) {
.first_name = strdup(argv[4]), // Don't change this line
.last_name = strdup(argv[5]), // Don't change this line
.age = atoi(argv[6])
};
// Print the two singles
print_person(p1);
print_person(p2);
// Next line just initialises the random function used in marry
srand(p2->age);
// Marry p1 and p2
marry(p1, p2);
// Print the two spouses
print_person(p1);
print_person(p2);
// Now: free the memory for p1 and p2! (Tricky!)
free_person(p1);
free_person(p2);
}
return 0;
}