sh-4.2# gcc -o main *.c                                                     
/tmp/cczKtK6E.o: In function `main':                                        
main.c:(.text+0x54e): undefined reference to `man_leaves'                   
main.c:(.text+0x560): undefined reference to `woman_leaves'                 
collect2: error: ld returned 1 exit status                                  
sh-4.2#

#include<stdio.h>
#include<stdlib.h>

// Defining all the variables that are used in below user defined functions
int max_queue=0;
int max_bathroom=0;
int men_bathroom=0;
int women_bathroom=0;
int men_queue=0;
int women_queue=0;
int cycle=1;
int turn=0;



void man_wants_to_enter()
{
// Checking for man whether he can enter the queue
// If there are women in bathroom or women in queue and the maximum strength of queue is less than the max limit then
// a man can enter the bathroom

if( max_queue < 5 && max_bathroom < 5 && women_bathroom > 0 || women_queue > 0 )
{
//if the above condition is true then a man enters the queue 
if ( max_bathroom == 0 )
{
printf(" Status of Bathroom : EMPTY \n ");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
}


men_queue++;
max_queue++;
printf(" please Wait in the Queue for your turn \n");
printf(" Man Enters the Queue \n");
printf(" \n Cycle - %d\n",cycle); 
printf(" Status of Queue : Strength of Men - %d \n",men_queue);
cycle++;
}
// if there aren't any women in the bathroom,there is enough space in bathroom then 
// a man can enter the washroom
else if(max_bathroom < 5)
{
if ( max_bathroom == 0 )
{
printf(" Status of Bathroom : EMPTY \n ");
}
men_bathroom++;
max_bathroom++;
// When a man enters bathroom, then men strength inside and total strength too increases
if(men_queue > 0){
// If there are men in the queue then their strength decreases as soon as a man enters bathroom
men_queue--;
max_queue--;
printf(" Man Exits the Queue \n " );
printf(" \n Cycle - %d\n",cycle);
 cycle++;
printf(" Status of Queue : Strength of men- %d \n",men_queue);
}
printf(" First Man in the Queue , Please Enter the bathroom \n");
printf(" Man Enters bathroom \n ");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
printf(" Status of Bathroom : Occupied by %d number of Men \n",men_bathroom);
}
else
{ printf(" 5 People maximum Allowed , Please wait for your turn \n");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
// This message shows up when someone asks for bathroom and when it is full
}

void man_leaves()
{ 
// when there are men in the bathroom and when they leave
if ( men_bathroom > 0 )
{
// Strength of bathroom and men decreases when someone leaves
max_bathroom--;
men_bathroom--;
printf(" Man leaves Bathroom \n ");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
printf(" Status of Bathroom : Strength of Men - %d\n",men_bathroom);
}
// When there are no men in the bathroom then women gets to enter the bathroom if they are in the queue first
if ((men_bathroom == 0)&& (women_queue > 0) && (max_bathroom < 5))
{
// Since the bathroom strenth is zero and women are in queue , they get to enter until there are no women in the queue
while ((women_queue > 0))
{
//while loop is to make sure every woman gets to enter the bathroom when there are no men
max_queue--;
women_queue--;
printf(" Women Leaves the queue \n");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
printf(" Status of Queue : Strength of women- %d\n",women_queue);
women_bathroom++;
max_bathroom++;
printf(" Woman Enters Bathroom \n");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
printf(" Status of Bathroom : Strength of Women - %d\n",women_bathroom);
}
}
else if((men_queue > 0) && ( max_bathroom < 5))
{
// if there no women in the queue and there are men in the bathroom then men gets to enter the bathroom and leave the queue
men_bathroom++;
max_bathroom++;
printf(" Man Enters the Bathroom \n");
printf(" \n Cycle - %d\n",cycle);
 cycle++;
printf(" Status of Bathroom : Strength of Men - %d\n",men_bathroom);
max_queue--;
men_queue--;
printf(" Men Leaves the Queue \n");
printf(" \n Cycle - %d\n",cycle);
 cycle++;
printf(" Status of Queue : Strength of Men - %d \n",men_queue);

}}}

void woman_wants_to_enter()
{
// Similar to the function man_wants_to_enter() , Here Woman requests for bathroom


if( max_queue < 5 && max_bathroom < 5 && men_bathroom > 0 || men_queue > 0 )
{
if ( max_bathroom == 0 )
{
printf(" Status of Bathroom : EMPTY \n ");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
}


women_queue++;
max_queue++;
printf(" please Wait in the Queue for your turn \n");
printf(" Woman Enters the Queue \n");
printf(" \n Cycle - %d\n",cycle); 
printf(" Status of the Queue : Strength of Women - %d\n",women_queue);
cycle++;
}

else if(max_bathroom < 5)
{
if ( max_bathroom == 0 )
{
printf(" Status of Bathroom : EMPTY \n ");
}
women_bathroom++;
max_bathroom++;
printf(" Women Enters the Bathroom \n");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
printf(" Status of the Bathroom : Strength of Women - %d\n",women_bathroom);
if(women_queue > 0){
// If there are men in the queue then their strength decreases as soon as a man enters bathroom
women_queue--;
max_queue--;
printf(" Woman Exits the Queue \n " );
printf(" \n Cycle - %d\n",cycle);
 cycle++;
printf(" Status of Queue : Strength of women- %d \n",women_queue);
}
printf(" First Woman in the Queue , Please Enter the bathroom \n");
printf(" Woman Enters bathroom \n ");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
printf(" Status of Bathroom : Occupied by %d number of Women \n",women_bathroom);
}
else
{ printf(" 5 People maximum Allowed , Please wait for your turn \n");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
// This message shows up when someone asks for bathroom and when it is full
}

void woman_leaves()
{ 
// Similar to the function man_leaves(), Here women leaves the bathroom
if ( women_bathroom > 0 )
{
max_bathroom--;
women_bathroom--;
printf(" Woman leaves Bathroom \n ");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
printf(" Status of Bathroom : Strength of Women - %d\n",men_bathroom);
}
if ((women_bathroom == 0)&& (men_queue > 0) && (max_bathroom < 5))
{
while ((men_queue > 0))
{
max_queue--;
men_queue--;
printf(" Man Leaves the queue \n");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
printf(" Status of Queue : Strength of men- %d\n",women_queue);
men_bathroom++;
max_bathroom++;
printf(" Man Enters Bathroom \n");
printf(" \n Cycle - %d\n",cycle); 
cycle++;
printf(" Status of Bathroom : Strength of Men - %d\n",women_bathroom);
}
}
else if((women_queue > 0) && ( max_bathroom < 5))
{
// if there no women in the queue and there are men in the bathroom then men gets to enter the bathroom and leave the queue
women_bathroom++;
max_bathroom++;
printf(" Woman Enters the Bathroom \n");
printf(" \n Cycle - %d\n",cycle);
 cycle++;
printf(" Status of Bathroom : Strength of Women - %d\n",men_bathroom);
max_queue--;
women_queue--;
printf(" Women Leaves the Queue \n");
printf(" \n Cycle - %d\n",cycle);
 cycle++;
printf(" Status of Queue : Strength of Women - %d \n",men_queue);

}}}

	main()
	{
	printf(" \n Hello , Welcome to the City Unisex Bathroom \n ");
	srand(time(NULL));
	int random = rand()% 2 + 1; 
	int gender = rand()%2 +1;
		while ( turn < 20 )
		{
			if ( random == 1) {
			if ( gender == 1) {
			printf(" \n Bathroom Requested by a Man \n");
			man_wants_to_enter();
			break;
			}
			else if ( gender == 2) {
			printf(" \n Bathroom Requested by a Woman \n");
			woman_wants_to_enter();
			break;
			}
			}
			else if ( random == 2) {
			if ( gender == 1) {
			man_leaves();
			break;
			}
			else if ( gender == 2) {
			woman_leaves();
			break;
			}
			}
			break;
		}
	}