C :

#include <stdio.h>

int main() {
    float fahrenheit;
    scanf("%f", &fahrenheit);
    printf("%.2f\n", 5 / 9.0 * (fahrenheit - 32.0));
    return 0;
}

C++ :

#include <stdio.h>
int a[100000];
int main()
{
	double n;
	while(scanf("%lf",&n)!=EOF)
	{
		printf("%.2lf\n",(n-32)*5/9);
	}
	return 0;
}

Java :

import java.text.DecimalFormat;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		
		DecimalFormat df=new DecimalFormat(".00");
		
		Scanner cin = new Scanner(System.in);
		double a;
		
		while (cin.hasNext()) {
			a = cin.nextDouble();
			a=(a-32)*5/9;
			System.out.println(df.format(a));
		}
	}
}