QN$\mathrm{.}1.$ Write a program in C to calculate the factorial of a given number using loops.

QN$\mathrm{.}2.$ Write a program in C to check whether a given number is prime or not.

QN$\mathrm{.}3.$ Modify the following code to use recursion instead of a loop:

#include

int main$()\{$

int i;

for $($i $=1$; i $<=5$; i$++)\{$

printf$("\%$d

$",$ i$)$;

$\}$

return $0$;

$\}$

QN$\mathrm{.}4.$

What would be the output of:

#include

void display$()$;

int main$()\{$

printf$("$Welcome

$")$;

display$()$;

return $0$;

$\}$

void display$()\{$

static int count $=0$;

printf$("$to C programming

$")$;

count$++$;

if$($count $<3)\{$

main$()$;

$\}$

$\}$

QN$\mathrm{.}5.$ USING CONDITIONAL STATEMENTS, WRITE THE C PROGRAMMING CODE FOR THE FOLLOWING:

a$.$ A parking lot charges $$2$ for the first hour or part thereof and $$1\mathrm{.}50$ for each additional hour or part thereof. Ask the user for the number of hours parked and calculate the total charge.

b$.$ A library charges a fine for books returned late. For the first $5$ days, the fine is $$0\mathrm{.}50$ per day, for $6$ to $10$ days the fine is $$1$ per day, and above $10$ days the fine is $$2$ per day. Ask the user for the number of days the book is late and calculate the fine.