Answered: In C write a grading program as…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

In C write a grading program as follows.
- Ask the user for the number of students and store it in an integer variable.
- Create an array of floats with four rows and columns equal to the number of students stored
earlier.
- Initialize the array to zeros.
Create a menu with the following options (use a do-while loop and repeatedly display the menu):
A or a to add student info one student at a time
T or t to display class average for homework
S or s to display class average for quizzes
B or b to display class average for exams
Z or z to exit program (program repeats until this exit command is entered)

Expert Solution

Step 1: Step 1

Here's a C program that implements the grading program as described:

1#include <stdio.h>
2
3int main() {
4    int numStudents;
5    
6    printf("Enter the number of students: ");
7    scanf("%d", &numStudents);
8
9    float grades[numStudents][4];  // Create a 2D array for student grades
10    for (int i = 0; i < numStudents; i++) {
11        for (int j = 0; j < 4; j++) {
12            grades[i][j] = 0.0;  // Initialize the array to zeros
13        }
14    }
15
16    char choice;
17    do {
18        printf("\nMenu:\n");
19        printf("A or a: Add student info\n");
20        printf("T or t: Display class average for homework\n");
21        printf("S or s: Display class average for quizzes\n");
22        printf("B or b: Display class average for exams\n");
23        printf("Z or z: Exit program\n");
24        printf("Enter your choice: ");
25        scanf(" %c", &choice);
26
27        switch (choice) {
28            case 'A':
29            case 'a':
30                // Add student info
31                printf("Enter student ID (0-%d): ", numStudents - 1);
32                int studentID;
33                scanf("%d", &studentID);
34                if (studentID >= 0 && studentID < numStudents) {
35                    printf("Enter homework, quizzes, and exams grades (space-separated): ");
36                    float hw, quiz, exam;
37                    scanf("%f %f %f", &hw, &quiz, &exam);
38                    grades[studentID][0] = hw;
39                    grades[studentID][1] = quiz;
40                    grades[studentID][2] = exam;
41                    printf("Student info added.\n");
42                } else {
43                    printf("Invalid student ID.\n");
44                }
45                break;
46                
47            case 'T':
48            case 't':
49                // Display class average for homework
50                float hwTotal = 0.0;
51                for (int i = 0; i < numStudents; i++) {
52                    hwTotal += grades[i][0];
53                }
54                printf("Class average for homework: %.2f\n", hwTotal / numStudents);
55                break;
56                
57            case 'S':
58            case 's':
59                // Display class average for quizzes
60                float quizTotal = 0.0;
61                for (int i = 0; i < numStudents; i++) {
62                    quizTotal += grades[i][1];
63                }
64                printf("Class average for quizzes: %.2f\n", quizTotal / numStudents);
65                break;
66                
67            case 'B':
68            case 'b':
69                // Display class average for exams
70                float examTotal = 0.0;
71                for (int i = 0; i < numStudents; i++) {
72                    examTotal += grades[i][2];
73                }
74                printf("Class average for exams: %.2f\n", examTotal / numStudents);
75                break;
76                
77            case 'Z':
78            case 'z':
79                // Exit program
80                printf("Exiting program.\n");
81                break;
82                
83            default:
84                printf("Invalid choice. Please try again.\n");
85        }
86    } while (choice != 'Z' && choice != 'z');
87
88    return 0;
89}
90

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