Printing info from an array of structs in C

Question

In my homework assignment for a programming paradigms class (learn only a little bit about many languages), we have been tasked with creating a student structs, creating an array of those structs, and then printing that information. Below is what I have so far.

#include <stdio.h>
struct student
{
  char name;
  int age;
  double gpa;
  char gradeLevel;
};

int main ()
{
  student struct classStudents[];

}

When I run this code i get an error saying "main.c:12:3: error: ‘student’ undeclared (first use in this function)".

Please help.

Note: the error is not occurring when you run the program. It is happening when you compile it. It is important to understand what happens in each phase of programming: pre-process, compile, link, run. — stark
– stark, Commented Feb 5, 2020 at 21:33

some user · Accepted Answer · 2020-02-05 22:15:09Z

2

Your type declaration is wrong for a structure type. Use this:

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

#define ST_SIZE 10
#define MAXNAME 64      /* don't skimp on buffer size */  //suggested by @David C Rankin

struct student {
    char name[MAXNAME]; // you want to store more than a character just,right?
    int age;
    double gpa;
    char gradeLevel; // change to array to store multiple char
};

int main() {

    struct student classStudents[ST_SIZE];

    // assigning value
    strcpy(classStudents[0].name, "First student"); // to make assign/copy some data to the name variable
    classStudents[0].age = 28;
    classStudents[0].gpa = 4.00;
    classStudents[0].gradeLevel = 'G';

    // printing it
    printf("%s %d %lf %c\n", classStudents[0].name, classStudents[0].age, classStudents[0].gpa,
           classStudents[0].gradeLevel);

    return 0;
}

3 Comments

David C. Rankin Over a year ago

See Updated Example -- feel free to incorporate any part you wish in your answer.

some user Over a year ago

@DavidC.Rankin thank you for pointing out initializing error, I was using -std=c++17

David C. Rankin Over a year ago

I could tell... :)

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