C :

#include<stdio.h>
void main()
{
	double f,c;
	scanf("%lf",&f);
	printf("c=%.2lf\n",(5.0/9)*(f-32));
}

C++ :

#include<iostream>
#include<iomanip>
#include<fstream>
#include<string> 
#include<climits>
#include<cctype>
#include<cmath>
#include<cstring>
using namespace std;

int main()
{
 //ifstream cin("aaa.txt");
  int i,j,n,m,k,sum,p,len,a[10001],l,count;
  
  float x,y;
  string s,b[1000];
  cin>>x;
  y=(x-32)*5.0/9;
  cout<<"c="<<fixed<<setprecision(2)<<y<<endl;
  

  	return 0;

}

Pascal :

var c,F:real;
begin
read(F);
if F>0 then write('c=',5*(F-32)/9:0:2)
       else write('c=',F:0:2);
end.

Python :

# coding=utf-8
f=float(input())
c=5*(f-32)/9
print('c=%.2f'%c)