Thread: structure with array elements

Hi,
I'm trying to create a program that will print and calculate a students average grade given 20 results. The user would have to enter the grades in manually. I am trying it out with 2 students and 3 results for simplicity. What I had in mind was:

Code:

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

struct name 
{
    char fname[20];
    char lname[20];
};

struct student
{
    struct name names;
    float grade[3];
};

int main (void)
{
    int i, j, k,l;
    struct student input[2];
        
    for (i = 0; i < 2; i++)
    {
        puts("Enter the students first name:");
        gets (input[i].names.fname);
        puts ("Enter the last name:");
        gets (input[i].names.lname);
        puts("Enter the students three (3) grades:");
        
        for (j = 0; j < 3; j++)
        {
            scanf ("%.2f", &input[i].grade[j]);
            
            while (getchar () != '\n')
            {
                continue;
            }
        }
        
        putchar ('\n');
    }
    
    for (k = 0; k < 2; k++)
    {
        printf ("Student %d: %s %s, grades: ", k+1, input[k].names.fname, input[k].names.lname);
            
        for (l= 0; l < 3; l++);
        {
            printf ("%.2f, ", input[l].grade[l]);
        }
    }    
    
     return 0;
}

The program takes the users input, but fails to print the grades correctly.

look here

Code:

        printf ("%.2f, ", input[l].grade[l]);

You'll always print the 1st grade of the 1st student, the 2nd grade of the 2nd student, the 3rd grade of the 3rd student, ..., ...

I have corrected the error and am still unable to get the correct entries to print on screen. I would enter:

Code:

a = input[0].names.fname 
b = input[0].names.lname
1 = input[0].grade[0]
2 = input[0].grade[1]
3 = input[0].grade[2]

but, would I get in return is:

Code:

Student 1: a b, grades: 0.00, Student 2: c d, grades: 0.00

Code:

scanf ("%.2f", &input[i].grade[j]);

You're scanning for a floating point value containing two decimal places.

My first suggest - run the program and enter "1.00", "2.00", "3.00" to see if the problem you're seeing goes away.

My second suggestion - just get rid of the format specifier in the "scan()" and retry it with your original values ("1", "2", "3").

Neither modifications are printing the correct output, when I changed to

Code:

scanf ("%f", &input[i].grade[j]);

it prints:

Code:

Student 1: a b, grades: 0.00, Student 2: c d, grades: -486501284064.00

entering both 1, 2, 3 or 1.00, 2.00, or 3.00