string1
string2
42

struct mystructure {
        char *string1;
        char *string2;
        int value;
} mystr;

fread(&mystr, sizeof(mystr), 1, fp);

printf("%s\n", mystr.string1);
printf("%s\n", mystr.string2);
printf("%d\n", mystr.value);

Segmentation fault

struct mystructure {
        char string1[64];
        char string2[64];
        int value;
} mystr;

fread(&mystr, sizeof(mystr), 1, fp);

printf("string1:  %s\n", mystr.string1);
printf("string2:  %s\n", mystr.string2);
printf("value:  %d\n", mystr.value);

string1:  string1
string2
42
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string2:
value:  -1216741388

size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream);

#include <stdio.h>
#include <string.h>

struct mystruct {
 char *string1;
 char *string2;
 int value;
};

struct mystruct *readmystruct(struct mystruct *s, FILE *fp)
{
 char buf[4096];
 if(fgets(buf, 4096, fp) == NULL) return(NULL);
 s->string1=strdup(buf);
 if(fgets(buf, 4096, fp) == NULL)
 {
   free(s->string1);
   return(NULL);
 }
 s->string2=strdup(buf);
 if(fgets(buf, 4096, fp) == NULL)
 {
  free(s->string1);
  free(s->string2);
  return(NULL);
 }
 s->value=atoi(buf);
 return(s);
}

int main()
{
 struct mystruct s;
 if(readmystruct(&s, stdin) == NULL)
 {
        printf("Couldn't read struct\n");
        return(1);
 }

 printf("string1:  %s\n", s.string1);
 printf("string2:  %s\n", s.string2);
 printf("value:  %d\n", s.value);

 return(0);
}

$ ./a.out < lines
string1:  string1

string2:  string2

value:  42

$