Practice Qs Switch Statement to Determine the Day of the Week

Using the Switch Statement to Determine the Day of the Week

In this article, we will explore how to use a switch statement in JavaScript to determine the day of the week based on a number input. This is a great example to demonstrate how switch statements can simplify decision-making when dealing with fixed values.

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Problem Statement

Write a program using a switch statement to print the name of the day corresponding to a number between 1 and 7. The mapping is as follows:

• 1 → Monday

• 2 → Tuesday

• 3 → Wednesday

• 4 → Thursday

• 5 → Friday

• 6 → Saturday

• 7 → Sunday

If the input is not within this range, display an appropriate error message.

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The Code Implementation

Here’s how the switch statement can be used to achieve the desired functionality:

let day = "6";

switch(day) {
    case "1":
        console.log("Monday");
        break;
    case "2":
        console.log("Tuesday");
        break;
    case "3":
        console.log("Wednesday");
        break;
    case "4":
        console.log("Thursday");
        break;
    case "5":
        console.log("Friday");
        break;
    case "6":
        console.log("Saturday");
        break;
    case "7":
        console.log("Sunday");
        break;
    default:
        console.log("Invalid day");
}

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Understanding the Code

1. Variable Declaration:
   A variable day is declared and assigned a value (in this case, "6").

2. Switch Statement:

   • The switch statement evaluates the value of day.

   • Each case represents a possible value of day (e.g., "1" for Monday).

   • If a match is found, the corresponding block of code executes, printing the day name.

3. Break Statement:

   • The break statement prevents the execution from "falling through" to the next case.

4. Default Case:

   • The default block handles any input that does not match the predefined cases, ensuring the program is robust against invalid inputs.

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Output

For the provided example, where day = "6", the output is:

Saturday

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Enhancements and Additional Information

1. Handling Numbers Directly
   In the current implementation, the day variable is a string. If you want to handle numeric input directly, you can modify the code to:

    let day = 6; // Now a number
   
    switch(day) {
        case 1:
            console.log("Monday");
            break;
        case 2:
            console.log("Tuesday");
            break;
        case 3:
            console.log("Wednesday");
            break;
        case 4:
            console.log("Thursday");
            break;
        case 5:
            console.log("Friday");
            break;
        case 6:
            console.log("Saturday");
            break;
        case 7:
            console.log("Sunday");
            break;
        default:
            console.log("Invalid day");
    }
   

   OUTPUT

   Saturday

2. Improved Error Handling
   Add checks to ensure the input is within the expected range:

    javascriptCopyEditlet day = 8;
   
    if (day < 1 || day > 7) {
        console.log("Error: Please enter a number between 1 and 7.");
    } else {
        switch(day) {
            case 1: console.log("Monday"); break;
            case 2: console.log("Tuesday"); break;
            case 3: console.log("Wednesday"); break;
            case 4: console.log("Thursday"); break;
            case 5: console.log("Friday"); break;
            case 6: console.log("Saturday"); break;
            case 7: console.log("Sunday"); break;
        }
    }
   

3. Real-World Application

   • This approach can be adapted for calendar or scheduling applications.

   • It can also serve as a learning tool for understanding days of the week in different languages.

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