Passing parameters struct to function in C - c

Question

I am System Analyst & Developer student, I'm trying to write code but I'm stuck, structs and fuctions are easy to understand but working with both together... is a... crap...
What an I doing wrong?
#include<stdio.h>
#include<stdlib.h>
#include<locale.h>
typedef struct mercearia
{
char mercadoria[20];
int quantidade;
int valor;
} mercearia;
void EstruturaCadastro(struct mercearia *m)
{
int i;
for(i = 0; i < 5; i++)
{
printf("\n");
setbuf(NULL, stdin);
printf("Insira nome do produto a cadastrar: ");
scanf("%s", &(*m)[i].mercadoria);
setbuf(NULL, stdin);
printf("Insira a quantidade do produto: ");
scanf("%i", &(*m)[i].quantidade);
setbuf(NULL, stdin);
printf("Insira o valor do produto: R$ ");
scanf("%i", &(*m)[i].valor);
}
}
int main(void)
{
setlocale(LC_ALL, "");
struct mercearia m[5];
EstruturaCadastro(&m);
}
It gives me huge error list. Then I wrote same code but without creating array of struct and the code worked perfectly. I am missing up something.
#include<stdio.h>
#include<stdlib.h>
#include<locale.h>
typedef struct mercearia
{
char mercadoria[20];
int quantidade;
int valor;
} mercearia;
void EstruturaCadastro(struct mercearia *x)
{
printf("\n");
printf("Insira nome do produto: ");
scanf("%s", &(*x).mercadoria);setbuf(NULL, stdin);
printf("Insira a quantidade do produto: ");
scanf("%i", &(*x).quantidade);setbuf(NULL, stdin);
printf("Insira o valor do produto: R$ ");
scanf("%i", &(*x).valor);setbuf(NULL, stdin);
}
int main(void)
{
setlocale(LC_ALL, "");
struct mercearia produto;
EstruturaCadastro(&produto);
}

Answer 1

You need to understand the 2nd example (simple) before trying the 1st (harder)
void EstruturaCadastro(struct mercearia *x)
{
printf("\n");
printf("Insira nome do produto: ");
scanf("%s", x->mercadoria);
printf("Insira a quantidade do produto: ");
scanf("%i", &x->quantidade);
printf("Insira o valor do produto: R$ ");
scanf("%i", &x->valor);
}
No need for the setbuf() call, you flush stdin when you press the key
Once you've done this, you can change to m[i]->mercadoria, etc in your first example.

Answer 2

There are all kinds of wrong with your original function. You're passing it a pointer to struct mercearia which is fine for passing in your array. Inside the function you can treat m the same way you would an array, so for example m[0].valor is how you'd access the valor value for the first element.
This means that your various calls to scanf become
scanf("%s", m[i].mercadoria);
scanf("%i", &m[i].quantidade);
scanf("%i", &m[i].valor);
Note, that for reading in a string unlike other data types, you don't need to pass in the pointer to the string so you don't need the preceeding &.