Creating a student grade book-how?
I'm trying to create a student database gradebook and I am clueless as to how to do it. These are my instructions and code for Part A.
There is one problem with the Part A code. When enterered my four grades they printed to the screen but not to the printer. How do I fix this?
I have no clue as to how to do Part B. My brain is fried and I could use some help desperately.
Can you please walk me through these instructions step by step for Part B with some examples?
Part A
This program will read data for one student and
compute and print the student’s average.
functions:
1.) get_integer - this function will be passed a
character array(empty) and the maximum number of
digits to be entered. The function should accept a
number from the keyboard into the character array and
check for input of only digits and for the maximum
number. You should stay in the function until an
acceptable value is entered. This function should work
for an int or a long.
2.) get_average - this function will be passed an
array of integer values that represents how many
elements are in the array. It will return the average
of these values, dropping the lowest value. The
average should be rounded off to an integer value
before returning it to the calling function.
1)Define the template of a data structure to contain
the student's complete name, course number
(itec21011101), social security number(must be a long)
and four test grades(values 0 to 110), and an integer
average. Define the template as a global.
2) In main define the structure variable. The program
should pass a function to a pointer in the structure
variable in main. The function will read in student's
name, course number(itec21011101), social security
number and accept the name for a max length of 20
characters, course number 11 characters and social
security number for 9 digits (Use the function to get
an integer with the modification to allow for exactly
9 digits.)
There should be a separate function(Use the function
to get an integer) to read in one grade
and return it to main. This last function should be
executed four times. Check each grade and make sure it
is no more than three digits and the value of each
grade should be 0 to 110. Each grade should be in the
structure.
I must use the get average function to compute the
grades dropping the lowest grade. When the average is
returned put in the structure average in main. Print
all information to the printer with all identifying
words from main.
Code:
#include <stdio.h>
#include <stdlib.h>
struct student {
char name[21];
char cnum[12];
long ssn;
int grades[4];
int average;
};
void get_data(struct student *);
void get_integer(char *string, int number);
int get_average(int *numbers, int number);
int main(void)
{ char string[10];
int test = 0;
int index = 0;
int flags;
struct student record;
get_data(&record);
do
{ flags = 0;
printf("\nEnter the grade %d [0-110] :", index+1);
get_integer(string, 3);
test = atoi(&string[2]);
if(test<=110 && test>0)
record.grades[index++]=test;
else
flags = 1;
}while ((flags==1)||(index < 4));
/*-- You will need to call get_average here --*/
record.average = get_average(record.grades,4);
printf("\n\nThe student's name is %s:\n",record.name);
//fprintf(stdprn,"\n\nThe student's name is %s:\n",record.name);
printf("The ssn is %ld:\n", record.ssn);
//fprintf(stdprn,"The ssn is %ld:\n", record.ssn);
printf("The course number is %s:\n", record.cnum);
//fprintf(stdprn,"The course number is %s:\n",record.cnum);
printf("The average of the four student grades is%d:\n", record.average);
//fprintf(stdprn,"The average of the four student grades is %d:\n", record.average);
return EXIT_SUCCESS;
}
void get_data(struct student *record)
{
char string1[23];
char string2[12];
char string3[13];
string1[0] = 20;
printf("Please enter the student's name: ");
cgets(string1);
strcpy(record->name, &string1[2]);
do
{ printf("\nPlease enter social security number [9DIGITS]: ");
get_integer(string2,9);
}while(string2[1]!=9);
/*-- To allow for the two count chars used by cgets --*/
/*-- we start the string copying at element 2.--*/
record->ssn=atol(&string2[2]);
string3[0]=12; /*-- Extra for the NULL char--*/
do
{ printf("\nEnter the course number [11 DIGITS]: ");
cgets(string3);
}while(string3[1]!=11);
/*-- To allow for the two count chars used by cgets--*/
/*-- we start the string copying at element 2.--*/
strcpy(record->cnum,&string3[2]);
}
void get_integer(char *string, int number)
{ int flags;
int index;
/*-- Allow for the null string terminator --*/
string[0]=number+1;
do
{ flags = 0 ;
cgets(string);
if(string[1] > number) /*-- Check input is the correct length --*/
{ printf("\nPlease re-enter [%d DIGITS]: ",number);
flags = 1;
continue;
}
/*-- To allow for the two count chars used by cgets --*/
/*-- we start the number checking from element 2.--*/
for(index=2 ; string[index] != '\0'; index++)
if (!isdigit(string[index]))
{ printf("\nOnly digits please!\n");
flags = 1;
break;
}
}while(flags == 1);
}
/*-- this function recieves the input array and size
of the array --*/
int get_average(int *numbers, int number)
{
int lowest;
float sum = 0;
int index;
int average;
for( index = 0 ; index < number ; index++)
{ if(index == 0) /*--to find the lowest set the first value in the array--*/
/*-- to the lowest variable and if a following value in the --*/
/*-- comparison is larger set it to the lowest variable--*/
lowest = numbers[0];
if(numbers[index] < lowest)
lowest = numbers[index] ;
sum += numbers[index]; /*-- sum up all the numbers--*/
}
average = (sum - lowest) / (number - 1)+ .5; /*-- get the average minus the lowest--*/
return average ; /*-- return the average as a long value --*/
}
Part B
Create a menu program that will include the following:
1. Create /Add student data
2. Delete student data
3. Record/Correct student records
4. Display student records
5. Statistical Analysis
6. Quit
Write a create/add function and the print function.
The create/add function should open the data file as
either create or add. Prompt the user to decide which
way the data file is to be opened, then input student
name, social security number and course number. Set
all grades and average to zero. Write the structure
to the file. The program is to check each field
entered for the maximum size and loop until the
correct data is entered. Modify the function to set
all grades and the average to zero.
The display function should display each student
record in the file to the screen in column form. All
other functions should display a message. The program
should continue looping until quit is chosen. The
data file to be used can be set up as an external
variable or constant. The menu should be defined in
an array of pointers.
Write the delete function. The function should request
from the user identifying information that will
determine which student’s information is to be
deleted. The file should stay in the order it is
already in. Also add wallpaper, color shadowing the
menu box, turning off the cursor and selecting from
the menu by highlighting the selections. Color should
be added to the functions already created.
Write the update function. This function should
request which grade the user wants to record for all
the students at one time. (Example: The teacher has
graded test 1 and wishes to record all the test 1
grades for the class). Before the file is rewritten,
the user should be allowed the option of having the
grades averaged at this time (use average function
that drops the lowest grade).
Write the statistical analysis function. The function
should analyze the student averages. Print to the
printer each student’s name and average. For the
class print to the printer the highest average, lowest
average, the average of the class and the standard
deviation with identifying literals. Also print on
the screen a frequency chart, in graphics mode,
showing how many A, B, C, D, and F final grades.
