Program we used to calculate the % error

#include <iostream>

using namespace std;

float mr, mo, per;

int main() {

    cout<<"Value of measure with ruler (real value): ";

    cin>>mr;

    cout<<"Value of measure obtained: ";

    cin>>mo;

    per=((mr-mo)/mr)*100;

    cout<<"The error obtained was of: "<<per<<"%"<<endl<<endl;

    return 0;

}