4. (20 points) Write a code that takes a year as input and finds out whether it is a leap year or not 5. (20 points)) Convert the following for loop and if else code into do while and switch case code [Do not use any for/if else] #include int main() { int num, i; printf("Enter a positive integer: "); scanf("%d", &num); printf("Factors of %d are: ", num); for (i = 1; i