C :

#include<stdio.h>
int main()
{
	float F;
	float c;
	while(scanf("%f",&F)!=EOF)
	{
		c=5*(F-32)/9.0;
		printf("c=%.2f\n",c);
	}
	return 0;
}

C++ :

#include<stdio.h>
int main()
{
	float a;
	scanf("%f",&a);
	printf("c=%.2f\n",5*(a-32)/9);
	return 0;
}

Pascal :

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