try this!!!

#include <string.h>
#include <iostream.h>
//you need this library to use getc() function
#include <stdio.h>

//this line goes at the top
#define MAX_STU 5

struct students {
    char name[30];
    int age;
    char grade[2];
    int iq;
};

struct students student_info(struct students data);
void print(struct students data);

void main(void) {
    //you need to put struct before students
    struct students student[MAX_STU];
    int i;

    //get the data
    //all arrays start with zero in C
    for (i=0; i<MAX_STU; ++i) {
    student[i] = student_info(student[i]);
    }

    //print the data
    //all arrays start with zero in C
    for (i=0; i<MAX_STU; ++i) {
    print(student[i]);
    }

    //this is just waiting for an input character,
    //for more information, see getc() function
    getc(stdin);
}

struct students student_info(struct students data) {
    cout << "what is the students name: ";
    //cin.getline (data.name, 30);
    //this is almost the same as the previous line
    cin >> data.name;
    cout << "What is the students age: ";
    cin >> data.age;
    cout << "What is the students grade: ";
    //cin.getline (data.grade, 2);
    //this is almost the same as the previous line
    cin >> data.grade;
    cout << "What is the students IQ: ";
    cin >> data.iq;
    //this goes to a new line
    cout << endl;
    return (data);
}


void print(struct students data) {
    cout << "Name: " << data.name << endl;
    cout << "Age: " << data.age << endl;
    cout << "Grade: " << data.grade << endl;
    cout << "IQ: " << data.iq << endl << endl;
}

Advice: next time you buy a new book, check it out in order to see if it's really good!
'Cause this example was really bad!

Regards,

------------------------
Abel Conde
[email protected]