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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
const size_t MAX_NAME_SIZE = 22;
struct Student
{
//gender should be BEFORE fn so the struct would be 28 bytes.
char name[MAX_NAME_SIZE + 1];
bool isMale;
size_t fn;
};
bool isLower(char ch)
{
return ch >= 'a' && ch <= 'z';
}
bool areAllLowerCase(const char* str)
{
while(*str)
{
if(!isLower(*str))
return false;
str++;
}
return true;
}
bool isUpper(char ch)
{
return ch >= 'A' && ch <= 'Z';
}
bool isNameValid(const char* name)
{
size_t len = strlen(name);
if(len == 0 || len > MAX_NAME_SIZE)
return false;
return isUpper(*name) && areAllLowerCase(name + 1);
}
void initStudent(Student& st, const char* name, size_t fn, bool isMale)
{
if(!isNameValid(name))
strcpy(st.name, "Unknown");
else
strcpy(st.name, name);
st.isMale = isMale;
st.fn = fn;
}
void saveToFile(const Student* students, size_t count, ofstream& file)
{
file.write((const char*)students, count * sizeof(Student));
}
int main()
{
const size_t studentsCount = 4;
Student* arr = new Student[studentsCount];
initStudent(arr[0], "Ivan", 1, true);
initStudent(arr[1], "Petur", 2, true);
initStudent(arr[2], "Alex", 3, true);
initStudent(arr[3], "Katerina", 4, false);
ofstream file("students.dat", ios::binary);
if(!file.is_open())
{
std::cout << "Error while opening the file!" << std::endl;
delete[] arr; //!
return -1;
}
saveToFile(arr, studentsCount, file);
delete[] arr;
return 0;
}
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