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Question on structures, arrays and functions

teerna (7)
Hi, I have to write a C++ program by passing structs to three functions Input_stud (to enter data about students eg name, id and testscores), Calculate_over(to calculate their overall percentage marks) and Disp_stud (to display their name, id and overall percentage marks) whilst making use of arrays to store the data. My teacher hasn't yet covered pointers so I can't use pointers.

I have to enter the data for n students but the three functions are not able to access the n from the main.

Here is my code:
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#include <iostream>

using namespace std;

struct student
{
    int id;
    string surname;
    string othername;
    int marks[];
    float total, avg;
};

void Input_stud(student []);
void Calculate_over(student []);
void Disp_stud(student []);


int main()

{
    student num[5];
    int n;

    cout<< "Enter the number of students.\n";
    cin>> n;

    Input_stud(num);
    Calculate_over(num);
    Disp_stud(num);

   return 0;

}

void Input_stud (student s[])
{
    for(int i=0; i<=n; i++)
    {
        cout<< "\nEnter student's info:\n";
        cout<< "Surname: ";
        cin>>s[i].surname;

        cout<< "Othername: ";
        cin>>s[i].othername;

        cout<< "ID: ";
        cin>>s[i].id;

        for(int j=0;j<4;j++)
        {
            cout<< "Testscores in"<<endl;
            cout<<"subject "<<j+1<< ":";
            cin>> s[i].marks[j];

        }



    }

}

void Calculate_over(student s[])
{
    for(int k=0; k<=n; k++)
    {
        s[k].avg= (s[k].marks[0]+ s[k].marks[1]+ s[k].marks[2]+s[k].marks[3])/4.0;

        cout<< "Overall percentage marks: "<<s[k].avg<< "%"<<endl;
    }

}

void Disp_stud(student s[])
{
    for(int i=0; i<=n; i++)
    {
        cout<< "\nDisplaying student's info: \n";
        cout<< "Name: "<<s[i].surname<< " "<<s[i].othername<<endl;
        cout<< "ID: "<<s[i].id<<endl;
        cout<< "Overall percentage marks: "<<s[i].avg<<endl;
    }
}
Last edited on
Anthony5347 (22)
The first thing I notice is that the arguments your sending to your functions are of type, int, when the parameters are supposed to be receiving arrays of type, student
Manga (1030)
There were some bugs to fix... here you go. Learn it, love it, live it!

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#include <iostream>
#include <string>
using namespace std;

struct student
{
    int id;
    string surname;
    string othername;
    int marks[5];
    float total, avg;
};

void Input_stud(student [], int);
void Calculate_over(student [], int);
void Disp_stud(student [], int);


int main()

{
    student num[5];
    int n;

    cout<< "Enter the number of students.\n";
    cin>> n;

    Input_stud(num, n);
    Calculate_over(num, n);
    Disp_stud(num, n);

	cin.clear();
	cin.get();
	cin.get();

   return 0;

}

void Input_stud (student s[], int n)
{
    for(int i=0; i<n; i++)
    {
        cout<< "\nEnter student's info:\n";
        cout<< "Surname: ";
        cin>>s[i].surname;

        cout<< "Othername: ";
        cin>>s[i].othername;

        cout<< "ID: ";
        cin>>s[i].id;

        for(int j=0;j<4;j++)
        {
            cout<< "Testscores in"<<endl;
            cout<<"subject "<<j+1<< ":";
            cin>> s[i].marks[j];

        }



    }

}

void Calculate_over(student s[], int n)
{
    for(int k=0; k<n; k++)
    {
        s[k].avg= (s[k].marks[0]+ s[k].marks[1]+ s[k].marks[2]+s[k].marks[3])/4.0;

        cout<< "Overall percentage marks: "<<s[k].avg<< "%"<<endl;
    }

}

void Disp_stud(student s[], int n)
{
    for(int i=0; i<n; i++)
    {
        cout<< "\nDisplaying student's info: \n";
        cout<< "Name: "<<s[i].surname<< " "<<s[i].othername<<endl;
        cout<< "ID: "<<s[i].id<<endl;
        cout<< "Overall percentage marks: "<<s[i].avg<<endl;
    }
}
teerna (7)
Thanks a lot, Manga and Anthony!
I have understood that I have to pass int n also as a parameter.
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