Question from class cant seem to type cast +another issue

[syntax010011]

Hi all,

I recently got an extra credit assignment for my intro to c++ class and I'm having 2 slight problems. One is if I make the variable "cannleft" seen in the programming to an integer instead of a double the program loops. I tried static_cast<int>(cannleft); with no avail. Also my calculations based on day and night movement of tarzan seems to double print every bunch of numbers calculated even though its counting properly over all. Any help would be greatly appreciated. I am going to paste the assignment first and then the code. All the best

Assignment:
-----------

Extra Credit #1
Cannibals, Missionaries & Tarzan


Background
Thirty cannibals begin to eat ten missionaries. It takes an hour to consume the first missionary. After each HOUR, one cannibal steals away into the forest. Each cannibal eats at a constant rate. Therefore, since there are fewer consumers (cannibals), fewer missionaries will be consumed in each hour.

Fortunately for the missionaries, help is on the way. Tarzan is coming! However, he is 80 miles away. During the day Tarzan travels at seven miles per hour. During the darkness he reduces his speed to 4 miles per hour. Darkness lasts nine hours. When the cannibals start eating, there are only three hours of light left.


Your Task
Write a program to calculate and display how many cannibals will be caught and how many missionaries saved (if any!!). Display your results in the following form:

END OF HOUR	MISSIONARIES LEFT	CANNIBALS EATING	TARZAN  DISTANCE	CURR MISS
BEING EATEN
-----------	----------------------------	-------------------------------------	--------------------	--------------------------
0	10	30	80	10
1	9	29	73	9
2	8	28	66	8
.	.	.	.	.
.	.	.	.	.
 

Consider that a missionary partially consumed is not a missionary saved.

Do the following:
1. Hand in the program.
2. Place the steps for the software development procedure in the top comment of your program.
3. Fully document (comments!!) your code.
4. Rerun your program with Tarzan only 30 miles away.

Extra Extra Credit Challenge
Change your program so that the program will read from the user the number of missionaries, the number of cannibals, and the distance Tarzan needs to travel. In other words your program should be general enough to handle any values for missionaries, cannibals, and the distance Tarzan needs to travel.

Code:
-----

//Extra Credit 2
//****************TO BE DETERMINED*************************

#include <iostream>
#include <iomanip>
#include <string>

using namespace std;

int main()
{
	//declare variables
	int hours,missionaries,tarzan,eaten,day=0,cannibals;
	double ratio=0,cannleft;
	
	
	//ask for inputs

	//asking for # of missionaries
	cout<<" Hello! \n"<<endl
		<<" Please enter the number of missionaries you are"<<endl 
		<<" calculating for (no spaces): ";
	   cin>>missionaries;

	//asking for # of cannibals
	cout<<"\n What are the current # of cannibals? ";
	   cin>>cannibals;

	//asking for distance tarzan is away
	cout<<"\n How Far away is Tarzan? ";
	   cin>>tarzan;

	//output title
	cout<<"\n CANNIBALS VS. MISSIONARIES: \n"<<endl;
	
	//output columns
	cout<<setw(15)<<"END OF HOUR"<<setw(12)<<"MISS LEFT"<<setw(13)<<"CANN EATING"<<
		setw(17)<<"TARZAN DISTANCE"<<setw(21)<<"CURRENT BEING EATEN"<<endl;
	cout<<setw(15)<<"-----------"<<setw(12)<<"---------"<<setw(13)<<"-----------"<<
		setw(17)<<"---------------"<<setw(21)<<"-------------------"<<endl;
	
	hours = 0; //start hours to count by
	cannleft=cannibals; //setting cannibals left (starting with)
	eaten=missionaries; //setting missionaries to start with being eaten

	//while loop w/ calculations and outputing the results
	for(eaten=missionaries; eaten>0; hours++) 
	{
	
		//output status of all variables
		cout<<setw(15)<<hours<<setw(12)<<eaten<<setw(13)<<cannleft<<setw(17)<<tarzan<<setw(21)<<eaten<<endl;
		
		ratio=cannleft/cannibals; //calculating consumption ratio
		cannleft=cannleft-ratio; //calculating cannibals left
		eaten=eaten-ratio; //calculating missionaries left after being eaten
		day++; //d+1
		
		//if-else statements to determine speed of tarzan based on day or night
	   if (day<=3)
		   tarzan=tarzan-7;
	   
	   else if (day<=9)
	       tarzan=tarzan-4;
	   
	   else
	       day=1;
	   if (tarzan<=0)
		   tarzan=0;
	   
	   
	}
	
	//outputing maker of the program	
	cout<<"\n This program is written by Jarred Sutton.\n"<<endl;

	return 0;

}

/*output

  Hello!

 Please enter the number of missionaries you are
 calculating for (no spaces): 20

 What are the current # of cannibals? 50

 How Far away is Tarzan? 80

 CANNIBALS VS. MISSIONARIES:

    END OF HOUR   MISS LEFT  CANN EATING  TARZAN DISTANCE  CURRENT BEING EATEN
    -----------   ---------  -----------  ---------------  -------------------
              0          20           50               80                   20
              1          19           49               73                   19
              2          18        48.02               66                   18
              3          17      47.0596               59                   17
              4          16      46.1184               55                   16
              5          15       45.196               51                   15
              6          14      44.2921               47                   14
              7          13      43.4063               43                   13
              8          12      42.5382               39                   12
              9          11      41.6874               35                   11
             10          10      40.8536               35                   10
             11           9      40.0366               28                    9
             12           8      39.2358               21                    8
             13           7      38.4511               17                    7
             14           6      37.6821               13                    6
             15           5      36.9285                9                    5
             16           4      36.1899                5                    4
             17           3      35.4661                1                    3
             18           2      34.7568                0                    2
             19           1      34.0616                0                    1

 This program is written by Jarred Sutton.

Press any key to continue . . .
Press any key to continue . . .

	*/

[syntax010011]

I used setprecision(0)<<fixed; to force the decimals away, but the day night calculation I am still working on. If I removed the numbers after the decimals improperly please let me know. Thanks!