我不能在 c 中将一个结构分配给另一个

Question

i have 2 structs, i want to assign one struct to another, but when i print the results, it prints crap, the functions : "ver_tope" is on charge to do that , what am i doing bad?, here is the code:

#include <stdio.h>
#include <stdlib.h>
#define TAM 4

typedef struct{
        char nomyap[40];
        int edad;

}t_info;

typedef struct {
    t_info pila [TAM];
    int tope;

}t_pila;

void ver_tope(const t_pila *p, t_info *d);

int main()
{
    t_pila pila;
    t_info info;
    //I CHARGE BOTH STRUCTS

    ver_tope(&pila, &info);

    return 0;
}

void ver_tope(const t_pila *p, t_info *d)
{
   *d = p->pila[(p->tope)-1];
    return ;
}

Answer 1

Try adding an initialisation for pila.tope in main() ex:

...    //I CHARGE BOTH STRUCTS
pila.tope =2;
ver_tope(&pila, &info);
...

That stopped the segmentation fault...

Answer 2

int main()
{
    t_pila pila;
    t_info info;
    ver_tope(&pila, &info);
    return 0;
}

You have not initialized either variable. Since pila is the source of the assignment you can do the following:

int main()
{
    t_pila pila = { 0 };
    pila.tope = 1;
    t_info info;
    ver_tope(&pila, &info);
    return 0;
}

Here I default initialized pila and then set its tope member to 1 . I did not initialize info since ver_tope assigns to it. It would be clearer if you converted ver_tope into a function that returned t_info .