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[英]Passing a Structure containing an array of String and an array of Integer into a C++ DLL
[英]Passing structure containing an array to function
我正在為大學項目編寫 C++ 中的學生管理程序。 我必須通過用戶輸入分配學生姓名,為每個學生隨機選擇 5 個不同的分數,然后計算分數的平均值作為第一個問題。 我必須只使用函數來做到這一點。 我無法分配main()
內部的值。
到目前為止,我的代碼看起來像這樣:
#include <iostream>
#include <string>
#include <iomanip>
using namespace std;
float random_marks(){
float Q[7];
float j{2};
for(int i{0}; i < 7; i++){
Q[i] = j;
j += 0.5;
}
float x = Q[rand() % 7];
return x;
}
struct student{
string imie;
float oceny[5];
float srednia;
};
student names(student stu[], int N){
float srednia{0};
for(int i =0; i < N; i++){
cout << "Prosze podac imie studenta Nr" << (i + 1) <<endl;
cin >> stu[i].imie;
}
}
student marks(student stu[], int N){
float srednia{0};
for(int i = 0; i < N; i++){
for(int j; j < 5; j++){
float x = losuj_oceny();
stu[i].oceny[j] = x;
}
}
}
int main(){
srand((unsigned) time(0));
int N{0};
cout << "prosze poac liczbe studentow ";
cin >>N;
struct student stu[N];
names(stu, N);
marks(stu, N);
return 0;
}
這些函數沒有傳遞main()
內部的值。 我嘗試使用指針,但是在將它們與結構一起使用時遇到了問題。
我試圖使用下面提到的代碼來解決您的問題陳述。
如果您需要任何進一步的幫助,請隨時寫信。
希望這會有所幫助。
#include <iostream>
#include <string>
#include <vector>
#include <iomanip>
#include <numeric>
// Total subject count
const int total_subjects = 5;
// Operator overloaded to print elements of vector
template <typename T>
std::ostream & operator << (std::ostream & os, const std::vector<T> & elements)
{
int subject_count = 0;
for(auto each_element : elements)
{
os<< "Mark of subject " << (subject_count+1) << " : "<< each_element<< "\n";
++subject_count;
}
return os;
}
// Our structure to store data of students
struct student{
std::string name;
std::vector<float> marks;
float average ;
};
// Returns random float number on every call
float random_marks(){
float Q[7];
float j{2};
for(int i{0}; i < 7; i++){
Q[i] = j;
j += 0.5;
}
float x = Q[rand() % 7];
return x;
}
// Calculates average from current marks of student
void calculate_average(struct student &p_data_container)
{
p_data_container.average = ((std::accumulate(p_data_container.marks.cbegin(),p_data_container.marks.cend(),0))/total_subjects);
}
// Seeks name of student
void get_student_name(struct student &p_data_container)
{
std::string current_name;
std::getline(std::cin >> std::ws, current_name);
p_data_container.name = current_name;
}
// Seeks marks of student
void get_student_marks(struct student &p_data_container)
{
for(int subject_number = 0 ; subject_number < total_subjects; ++subject_number)
{
p_data_container.marks.push_back(random_marks());
}
}
// Used to display data of container
void display_student_data(struct student &p_data_container)
{
std::cout << "Student Name : " << p_data_container.name << "\n";
std::cout << "Student Marks : \n" << p_data_container.marks << "\n";
std::cout << "Average of Marks : " << p_data_container.average << "\n";
}
int main(){
srand((unsigned) time(0));
int total_students = 0;
std::cout << "Please enter student count : ";
std::cin >>total_students;
struct student* database = new struct student[total_students];
for(int student_number = 0; student_number < total_students ; ++student_number)
{
std::cout << "Please enter the name of the student No. " << (student_number + 1)<<std::endl;
get_student_name(database[student_number]);
get_student_marks(database[student_number]);
calculate_average(database[student_number]);
display_student_data(database[student_number]);
}
delete[] database;
return 0;
}
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