error: expected ';' , ',' or ')' before 'int'

I keep getting this error message:
"error: expected ';' , ',' or ')' before 'int' "
for line 10:
int assigned_door (int x int y)

I can't figure out why. Help is needed.
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#include<stdio.h>
#include<stdlib.h>
#include<time.h>

int prize, door_picked, door_opened, door_to_switch, finally_picked_door;
int num_game_played=0;
int num_game_won=0;
float num_won_simulation=0;
float num_simulation=0;
int assigned_door (int x int y);
int final_picked_door (int a, int b, int c);
void game_mode();
void research_mode();
void menu();


int main()
{
    /*Generate a seed for generating random numbers in the program*/
    srand(time(NULL));

    printf("Welcome to the Monty Hall.\n");
    menu();
    return 0;
}






void game_mode ()
{   int switch_or_not;
    /*Prompt the user to pick a door*/
    printf("Please enter the door number you want to choose.\nDoor 1      Door 2      Door 3\n");
    scanf("%d", &door_picked);

    /*Put the prize randomly behind a door 1-3*/
    prize=rand()%3+1;

    /*Monty Hall opens a door and asks the user if he/she wants to swich*/
    door_opened=assign_door (prize, picked_door);
    printf("Monty Hall just opened Door %d, and there is no prize behind it.\n Would you like to pick another door? Press 1 for yes; 0 for no.\n", door_opened);
    scanf("%d", &switch_or_not);

    /*What to do after the user has decided to switch or not: */
        door_to_switch = assign_door (picked_door, door_opened);
        finally_picked_door=final_picked_door(switch_or_not, picked_door, door_to_switch); /*Assign finally_picked_door to door_to_switch*/
        if(finally_picked_door==prize) /*Determine if the user has won and inform the user*/
        {
            num_game_won++;              /*Count the number of wins*/
            printf("The prize is behind the door you picked. You have won the game.\n");
        }
        else
            printf("the prize is behind Door %d. You did not win.\n", prize);
    num_game_played++;     /*Count the number of games played*/
    /*Inform the user how many game have been played and how many were won*/
    printf("You have played the game %d times and won %d times.\n", num_game_played, num_game_won);
    return;
}



void research()
{
    int N,switch_in_research;
    float chance_of_win=num_won_simulation*100.00/num_simulation;
    num_won_simulation=0.0;
    num_simulation=0.0;

    /*Ask the user how many rounds to simulate*/
    printf("Enter the number of game you want to simulate.\n");
    scanf("%d", &N);
    /*Ask the user what strategy to use*/
    printf("Do you want to switch after Monty Hall opens a door? Yes-press 1. No-press 0.\n");
    scanf("%d", &switch_in_research);
    while(N>num_simulation)
        {
            prize=rand()%3+1;
            door_picked=1;
            door_opened=assign_door (prize, picked_door);
            door_to_switch = assign_door (picked_door, door_opened);
            finally_picked_door=final_picked_door(switch_in_research, picked_door, door_to_switch); /*Assign finally_picked_door to door_to_switch*/
            if(finally_picked_door == prize)
            	num_won_simulation++;
        }
     if (switch_in_research==1)   /*The user decided the switch*/
        printf ("The chance of winning if you switch is %f%%\n", chance_of_win);

    else/*The user decided not to switch*/
        printf ("The chance of winning if you don't switch is %f%%\n", chance_of_win);
    return;
}


void menu()
{   int user_choice, while_controller1, while_controller2;
    while_controller1=1;
    while(while_controller1)
    {
    	printf("You have the following three options:\n1. Game Mode\n2. Research Mode\n3. Exit\n Enter the option you want(1-3).\n");
    	while_controller2=1;
    	while(while_controller2)
    	{
    		scanf("%d", &user_choice);
    		switch(user_choice)
    		{
        		case 1:
        		{
           		 	game_mode();
            			while_controller2=0;
            			break;
        		}
        		case 2:
        		{
            			research();
            			while_controller2=0;
            			break;
        		}

        		case 3:
        		{
            			while_controller1=0;
            			while_controller2=0;
            			break;
        		}

        		default:
        		{
        			printf("Please enter a valid option");
            			break;
        		}

    		}
    	}
    }
    return;
}


/*This function designate the door to be opened by Monty Hall and the door to switch to if the user chooses so*/
int assigned_door (int x int y)
{
    int chosen_door=0;
    do
    {
        chosen_door++;
    }
    while ((chosen_door==x) || (chosen_door==y) ) /*The program tries doors 1-3 until the assigned door is equal to neither of the doors represented by x and y*/
    return chosen_door;
}



/*This function designate the door eventually picked by the user after he/she has decided to switch or not*/
int final_picked_door (int a, int b, int c) /*In the program, a will be replaced by the choice of the user on wheter to switch or not; b will be replaced by picked_door; c will be replaced by door_to_switch*/
{
	if (a==1) /*The user has decided to switch*/
	{
	    b=c; /*The finally picked door will be the door swtiched to*/
	}
	else /*The user has decided not to switch*/
    {
        b=b; /*The finally picked door is still the initially picked door*/
    }
    return b;
}

Last edited on
Look at the function below it, see what you missed? The compiler tells you.
I figured out what happened. I missed "," between x and int.
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