how to write a reading function of a struct variable? - c

Question

I have to write a function that reads from the keyboard a structure type variable and a function that displays a structure type variable. Subsequently, I have to use these functions to read and display a n number of elements of the structure. That's what I managed to write, but it does not look very correct and logical. I'd be very happy to help. Here's my code :
#include <stdio.h>
struct data{
int d, m, y;
}dt;
void readData(struct data element){
printf("\nData format dd-mm-yyyy : ");
scanf("%d %d %d", &element.d,&element.m,&element.y);
}
void read(struct data element,int n){
for(int i = 0; i < n; i++){
readData(element);
}
}
void display(struct data element){
printf("\n %d.%d.%d\n",element.d,element.m,element.y);
}
void displayN(struct data element, int n){
for(int i = 0; i < n; i++){
display(element);
}
}
int main() {
struct data dd1;
read(dd1,3);
displayN(dd1,3);
return 0;
}

Answer 1

It looks like you want to use an array.
#include <stdio.h>
struct data{
int d, m, y;
}dt;
/* use pointer to an element to modify the data */
void readData(struct data *element){
printf("\nData format dd-mm-yyyy : ");
scanf("%d %d %d", &element->d,&element->m,&element->y);
}
/* use an array to read data (just syntax sugar, this argument element is actually a pointer) */
void read(struct data element[],int n){
for(int i = 0; i < n; i++){
readData(&element[i]);
}
}
/* you don't need to use a pointer here because the value is just printed and not changed */
void display(struct data element){
printf("\n %d.%d.%d\n",element.d,element.m,element.y);
}
/* use an array to print multiple data */
void displayN(struct data element[], int n){
for(int i = 0; i < n; i++){
display(element[i]);
}
}
/* define the number of elements and use that to avoid typo */
#define N 3
int main(void) {
struct data dd1[N]; /* declare an array */
read(dd1,N);
displayN(dd1,N);
return 0;
}