added todays ex. 1, 4. note: buffer overflow in ex 4

20230413/1/main.c

+#include <stdio.h>
+#include <string.h>
+
+#define ARR_LEN(a) (sizeof(a) / sizeof(*a))
+
+typedef struct {
+    char first_name[64];
+    char last_name[64];
+    unsigned short age;
+} Person;
+
+void strip(char *s) {
+    s[strcspn(s, "\n")] = '\0';
+}
+
+char *str_input(char *s, size_t size) {
+    char *ret = fgets(s, size, stdin);
+    strip(ret);
+    return ret;
+}
+
+Person person_read() {
+    Person ret;
+    puts("nome");
+    str_input((char *)&ret.first_name, ARR_LEN(ret.first_name));
+    puts("cognome");
+    str_input((char *)&(ret.last_name), ARR_LEN(ret.last_name));
+    puts("eta'");
+    scanf("%hu", &ret.age);
+    return ret;
+}
+
+void person_print(Person person) {
+    printf(
+        "nome: %s\ncognome: %s\neta': %hu\n",
+        person.first_name,
+        person.last_name,
+        person.age
+    );
+}
+
+int main(void) {
+    person_print(person_read());
+}

20230413/4/in.txt

+Mario Rossi 40
+Giuseppe Verdi 70

20230413/4/main.c

+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define ARR_LEN(a) (sizeof(a) / sizeof(*a))
+
+typedef struct {
+    char first_name[64];
+    char last_name[64];
+    unsigned short age;
+} Person;
+
+Person person_read(FILE *f) {
+    Person person;
+    // FIXME: buffer overflow
+    fscanf(
+        f, "%s %s %hu\n",
+        person.first_name,
+        person.last_name,
+        &person.age
+    );
+    return person;
+}
+
+void person_print(FILE *f, Person person) {
+    fprintf(f, 
+        "[Nome]: %s [Cognome]: %s [Età]: %hu\n",
+        person.first_name,
+        person.last_name,
+        person.age
+    );
+}
+
+int main(void) {
+    FILE *f_in; 
+    if (!(f_in = fopen("in.txt", "r"))) {
+        return EXIT_FAILURE;
+    }
+
+    Person p1 = person_read(f_in);
+    Person p2 = person_read(f_in);
+
+    fclose(f_in);
+
+    FILE *f_out;
+    if (!(f_out = fopen("out.txt", "w"))) {
+        return EXIT_FAILURE;
+    }
+    person_print(f_out, p2);
+    person_print(f_out, p1);
+
+    fclose(f_out);
+
+}