So everything seems to be working fine here, but after the first calculation that converts 0C to 32F, it just adds increments of 1 to each Fahrenheit. Why isn't the formula being repeated for each increasing value of Celcius? Help would be greatly appreciated, as I have spent hours trying to figure this out.

Code:
# include <iostream>
# include <iomanip>
using namespace std;

int main()
{
	
	double c;
	 cout << setw(4) << "Celcius" << setw(7) << "" << "Fahrenheit" << endl;
	 

	
	for (c = 0; c <= 20; c++)
		 {
			double f = (9/5) * c + 32;
			
				

			 cout << setw(4) << c << setw(7) << " " << " " << " " << " " << f << endl; 
	}

			  
	 
		 
	return 0;
	}