Temperature converter

#include <iostream>

using namespace std;

int main(){

float l;
float h;
int s;


cout<<"Please give in a lower limit, limit >= 0: "<<endl;
cin>>l;
cout<<"Please give in a higher limit, 10 > limit ,= 50000: "<<endl;
cin>>h;
cout<<"Please give in a step, 0 < step <= 10: "<<endl;
cin>>s;
cout<<""<<endl;
cout<<"Celsius"<<"          "<<"Fahrenheit"<<endl;
cout<<"-------"<<"          "<<"----------"<<endl;

for(int i=l; i <=h; i = i+s)
{
    cout<<left<<setprecision(8)<<showpoint<<i<<endl;

}



return 0;
}