Question

Assignment (C language, not C ++)

Start a new project to store grade information for 5 students using structures.

1. Declare a structure called student_t that contains :
   
   • First name
   • Last name
   • Student ID Number
   • Percentage grade
   • Letter grade
     
2. Create the following functions:
   
   getStudentInfo(void)- Declares a single student object
   - Uses printf()/scanf() to get keyboard input for Name, SID, and Percentage (not Letter).
   - Returns a single student structure
   
   calcStudentGrade(student_t *st_ptr)- Takes the pointer to a student (to avoid making a copy)
   - Uses the student's percentage to determine and store their letter grade
   
   printStudentInfo(student_t *st_ptr)- Takes the pointer to a student (to avoid making a copy)
   - Prints out all of the student information
   
3. Declare an array of five students
   
4. Using a for loop and getStudentInfo() function, get input of all the students
   
5. Using a for loop and calcStudentGrade() function, determine and store all student's letter grades.
   
6. Using a for loop and printStudentInfo() function, print all the output of all students.
   

Example output:

     NAME              SID         SCORE   GRADE
     Hopper, Grace     135792468   97.5%   A
     Turing, Alan      198765432   82.9%   B
     Babbage, Charles  165754329   79.0%   C
     Lovelace, Ida     147632391   92.4%   A
     Neumann, John     200638730   99.0%   A

Answer 1

Code:

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
struct student_t
{
  char first_name[20];
  char last_name[20];
  int id;
  float per;
  char grad[1];
};
struct student_t s[5];

struct student_t* getStudentInfo(){
  for(int i=0; i<5; i++)
 {
  printf("Enter %d student's first name : ",i+1);
  scanf("%s",s[i].first_name);
  printf("Enter %d student's last name : ",i+1);
  scanf("%s",s[i].last_name);
  printf("Enter %d student ID: ",i+1);
  scanf("%d",&s[i].id);
  printf("Enter %d student percentage: ",i+1);
  scanf("%f",&s[i].per);
 }
 return s;
}

void calStudentGrade(struct student_t* s){

 for(int i=0; i<5; i++)
 {
  if(s[i].per>=90)
    strcpy(s[i].grad,"A");
  else if(s[i].per>=80 && s[i].per<90)
    strcpy(s[i].grad,"B");
  else if(s[i].per>=70 && s[i].per<80)
    strcpy(s[i].grad,"C");
  else if(s[i].per>=60 && s[i].per<70)
    strcpy(s[i].grad,"D");
  else if(s[i].per>=60 && s[i].per<70)
    strcpy(s[i].grad,"E");
  else
    strcpy(s[i].grad,"F");
 }
}

void printStudentInfo(struct student_t* s){

  printf("NAME\t\t\tSID\t\t\tSCORE\t\tGRADE\n");
  for(int i = 0;i<5;i++)
  {
    printf("%s, %s\t%d\t\t\t%.2f\t\t%s\n",s[i].last_name,s[i].first_name,s[i].id,s[i].per,s[i].grad);
  }
}

int main()
{
 struct student_t* st = getStudentInfo();
 calStudentGrade(st);
 printStudentInfo(st);

  return 0;
}

(Feel free to throw an upvote or comment below if you have any doubts)