ahmad alhayek

Question

Problem: Given as input the year, day of the week number (0 [Sunday] through 6 [Saturday]), and occurrence number, determine

i need a program that uses selection but avoids using arrays and structures.

((year – 1)365+ [year -]- year - 17 [year - 1 + 100 400 -- % 7 The formula determines the day based on the values as shown be

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Answer 1

CODE:

#include <stdio.h>

const char* dayOfWeek(int day);
int getFirstDay(int year, int day);
void getFinalDate(int occurence, int day, int year);

int main()
{
    int year, day, occurence;
    printf("Enter year number -> ");
    scanf("%d", &year);
    printf("Enter day of week number -> ");
    scanf("%d", &day);
    printf("Enter occurence number -> ");
    scanf("%d", &occurence);
    getFinalDate(occurence, day, year);
    return 0;
}

const char* dayOfWeek(int day) {
    switch(day) {
        case 0:
            return "Sunday";
        case 1:
            return "Monday";
        case 2:
            return "Tuesday";
        case 3:
            return "Wednesday";
        case 4:
            return "Thursday";
        case 5:
            return "Friday";
        case 6:
            return "Saturday";
    }
}

int getFirstDay(int year, int day) {
    int firstDay = ((year - 1) * 365) + ((year - 1) / 4) - ((year - 1) / 100) + ((year - 1) / 400);
    firstDay = (firstDay % 7) + 1;
    for(int i = 0; i < 7; i++)
        if((firstDay + i) % 7 == day)
            return i + 1;
}

void getFinalDate(int occurence, int day, int year) {
    int requiredDay = getFirstDay(year, day) + ((occurence - 1) * 7), feb = 28;
    if((!(year % 4) && (year % 100)) || !(year % 400))
        feb = 29;
    switch(1) {
        case 1:
        if(requiredDay <= 31) {
            printf("Desired occurence #%d of %s in %d: January %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= 31;
        case 2:
         if(requiredDay <= feb) {
            printf("Desired occurence #%d of %s in %d: February %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= feb;
        case 3:
        if(requiredDay <= 31) {
            printf("Desired occurence #%d of %s in %d: March %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= 31;
        case 4:
        if(requiredDay <= 30) {
            printf("Desired occurence #%d of %s in %d: April %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= 30;
        case 5:
        if(requiredDay <= 31) {
            printf("Desired occurence #%d of %s in %d: May %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= 31;
        case 6:
        if(requiredDay <= 30) {
            printf("Desired occurence #%d of %s in %d: June %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= 30;
        case 7:
        if(requiredDay <= 31) {
            printf("Desired occurence #%d of %s in %d: July %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= 31;
        case 8:
        if(requiredDay <= 31) {
            printf("Desired occurence #%d of %s in %d: August %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= 31;
        case 9:
        if(requiredDay <= 30) {
            printf("Desired occurence #%d of %s in %d: September %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= 30;
        case 10:
        if(requiredDay <= 31) {
            printf("Desired occurence #%d of %s in %d: October %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= 31;
        case 11:if(requiredDay <= 30) {
            printf("Desired occurence #%d of %s in %d: November %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= 30;
        case 12:
        if(requiredDay <= 31) {
            printf("Desired occurence #%d of %s in %d: Decemeber %d", occurence, dayOfWeek(day), year, requiredDay);
            break;
        }
        requiredDay -= 31;
        default:
            printf("Invalid Year");
    }
}

OUTPUT:

Enter year number -> 2021 Enter day of week number -> 1 Enter occurence number -> 11 Desired occurence #11 of Monday in 2021: