C Programming

Section 2 : Switch

Exercise 1: Day of the Week

Take a number representing a day of the week (1 for Monday, 2 for Tuesday, ..., 7 for Sunday) as input. Output the corresponding day's name.

Input Example:

Enter a number (1-7): 3

Output Example:

The day of the week is Wednesday.

Exercise 2: Grade Evaluation

Take a numerical grade as input and output the corresponding letter grade based on the following grading criteria using the switch statement in C. A: 90-100

B: 80-89

C: 70-79

D: 60-69

F: 0-59

Input Example:

Enter your numerical grade: 87

Output example:

Your letter grade is: B

Code Example of Exercise 1

#include <stdio.h>

int main() {
    int dayNumber;

    // Input day number from the user
    printf("Enter a number (1-7): ");
    scanf("%d", &dayNumber);

    // Using a switch statement to determine the day's name
    switch (dayNumber) {
        case 1:
            printf("The day of the week is Monday.\n");
            break;
        case 2:
            printf("The day of the week is Tuesday.\n");
            break;
        case 3:
            printf("The day of the week is Wednesday.\n");
            break;
        case 4:
            printf("The day of the week is Thursday.\n");
            break;
        case 5:
            printf("The day of the week is Friday.\n");
            break;
        case 6:
            printf("The day of the week is Saturday.\n");
            break;
        case 7:
            printf("The day of the week is Sunday.\n");
            break;
        default:
            printf("Invalid input. Please enter a number between 1 and 7.\n");
    }

    return 0;
}

Code Example of Exercise 2

#include <stdio.h>

int main() {
    int numericalGrade;

    // Input numerical grade from the user
    printf("Enter your numerical grade: ");
    scanf("%d", &numericalGrade);

    // Using a switch statement to determine the letter grade
    char letterGrade;
    switch (numericalGrade / 10) {
        case 10:
        case 9:
            letterGrade = 'A';
            break;
        case 8:
            letterGrade = 'B';
            break;
        case 7:
            letterGrade = 'C';
            break;
        case 6:
            letterGrade = 'D';
            break;
        default:
            letterGrade = 'F';
    }

    // Output the letter grade
    printf("Your letter grade is: %c\n", letterGrade);

    return 0;
}

It creates a switch statement that takes the value of numericalGrade / 10 as the controlling expression. This allows to group numerical grades into ranges corresponding to letter grades. This program assumes that the input grade is an integer value between 0 and 100. It rounds down to the nearest 10 to determine the letter grade based on the provided grading criteria.