1 st Test case is fail in (FAHRENHEIT TO CELSIUS)

#include
using namespace std;
int main()
{
int s,minF,maxF,c;
cin>>minF>>maxF>>s;
if((minF<100 && minF>0) && (maxF<500 && maxF>minF ) && (s>0) )
{
for(int i = minF ;i<=maxF;i+=20)
{
c=(float(5)/9)*(i-32);
cout<<i<<" "<<c<<endl;
}

}
return 0;

}