Conversion(Fahrenheit to Celsius)

#include
#include
using namespace std;
int main(){
int mf,maf,step,f,c;
f=mf;
while(f<=maf||0<mf<100||mf<maf<500||0<step){mf=mf+step;
c=(f-32)*5/9;
cout<<f<<" "<<c<<endl;
break;}
return 0;
}

this is giving wrong result

Is your code complete? Where have you taken the input. Also you have made the while loop complex. Dry run with any sample case. The problem is simple:

Take input minimum fahreheit value : min
Take input maxm value: max
Take input the step size: step
Now run a for loop from min to <=max with a step size of step like this:
for(int i=min;i<=max;i+=step)
{
apply the formula
c=(i-32) * (5/9)
print i and c as the desired format
}