Gregorian calendar Date

#include <stdio.h>enum days
    {
    Monday,Tuesday,wednesday,thursday,friday,saturday,sunday
    };
int main (int argc, const char * argv[])
{
  
    int sourceyear = 1900;
    int currentyear;
    printf("\nEnter the currentyear:");    scanf("%d",&currentyear);
  
    int x = ((currentyear -sourceyear )%7);
    switch (x)
    {
        case Monday:
            printf("Monday");
            break;
        case Tuesday:
            printf("Tuesday");
            break;
        case wednesday:
            printf("wednesday");
            break;
        case thursday:
            printf("thursday");
            break;
        case friday:
            printf("friday");
        case saturday:
            printf("saturday");
        case sunday:
            printf("sunday");
        default:
            break;
    }
    return 0;
}