16.c

#include <stdio.h>

void intro(void)
{
    printf("Name: Sharafat\n");
    printf("Id  : 2102024\n");
}

int main()
{
    intro();
    int day;
    printf("Enter the numeric weekday value (1-7): ");
    scanf("%d", &day);
    
    switch(day) {
        case 1:
            printf("Monday");
            break;
        case 2:
            printf("Tuesday");
            break;
        case 3:
            printf("Wednesday");
            break;
        case 4:
            printf("Thursday");
            break;
        case 5:
            printf("Friday");
            break;
        case 6:
            printf("Saturday");
            break;
        case 7:
            printf("Sunday");
            break;
        default:
            printf("Invalid input. Please enter a value between 1 and 7.");
    }
    
    return 0;
}