C Program to Print Day of the Week for Numbers 1 to 7

Introduction:

When learning C programming, it’s common to start with simple input-output tasks. One such task is writing a C program to print day of the week based on user input from 1 to 7. This type of logic-building program helps beginners get comfortable with conditional statements like if-else or switch.

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Problem Statement:

Write a C program that takes a number between 1 and 7 as input. Based on the number, the program should display the day of the week:

• 1 → Sunday
• 2 → Monday
• 3 → Tuesday
• 4 → Wednesday
• 5 → Thursday
• 6 → Friday
• 7 → Saturday
  If the user enters a number outside 1 to 7, the program should show an error message.

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C Program Using Switch Statement:

#include <stdio.h>

int main() {
    int day;

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

    // Print the corresponding day
    switch(day) {
        case 1:
            printf("Sunday\n");
            break;
        case 2:
            printf("Monday\n");
            break;
        case 3:
            printf("Tuesday\n");
            break;
        case 4:
            printf("Wednesday\n");
            break;
        case 5:
            printf("Thursday\n");
            break;
        case 6:
            printf("Friday\n");
            break;
        case 7:
            printf("Saturday\n");
            break;
        default:
            printf("Invalid input! Please enter a number between 1 and 7.\n");
    }

    return 0;
}

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Explanation of the Code:

• The program reads an integer using scanf.
• It then uses a switch statement to check the value.
• Each case prints a specific day from Sunday to Saturday.
• The default case handles invalid inputs.

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Why Use Switch Instead of If-Else?

• Better readability for multiple conditions.
• Faster execution for discrete values like menu options.
• Easier to maintain or expand in the future.

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Real-World Use Cases:

This logic applies to:

• Weekly scheduling apps
• Menu-driven programs
• Date and time utilities
• Day-specific reminders

• If Else vs Switch in C

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Conclusion:

By using the switch statement, you can efficiently write a C program to print day of the week for numbers 1 to 7. It’s a basic but essential exercise to build your understanding of input handling and control flow in C.