C :

#include <stdio.h>
int main()
{
 float F,c;
 scanf("%f",&F);
 c=5*(F-32)/9;
 printf("c=%.2f\n",c);

}

C++ :

#include <bits/stdc++.h>
using namespace std;
float n;
int main()
{
    cin>>n;
    printf("c=%.2f",5*(n-32)/9);
    return 0;
}

Pascal :

var n:real;
begin
  readln(n);
  write('c=',5*(n-32)/9:0:2);
end.