Why test cases not passing

#include
using namespace std;

int main() {
int f=0;
int mf=500;
int c;
while(f<=mf){
c=(5*(f-32))/9;
cout<<f<<’\t’<<c<<endl;
f=f+20;

}
return 0;

}

@safwanjaved5742_779f5468729e3535 you have to take user input for the values

#include
using namespace std;

int main() {
int f;
cin>>f;
int mf;
cin>>mf;
int c;
while(f<=mf){
c=(5*(f-32))/9;
cout<<f<<’\t’<<c<<endl;
f=f+20;

}
return 0;

}
Still single case not passing?

@safwanjaved5742_779f5468729e3535
The third line of the input contains an integer denoting the Step.
Input the step also, and do f = f + step

#include
using namespace std;

int main() {
int f;
cin>>f;
int mf;
cin>>mf;
int step=20;
int c;

while(f<=mf){

	c=(5*(f-32))/9;
	cout<<f<<'\t'<<c<<endl;
	f=f+step;
	

}
return 0;

}

Still not passing please edit my code where it is wrong

@safwanjaved5742_779f5468729e3535 you have to take INPUT for the step, cin >> step, you are assigning it as 20 but it can change for every test case

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