避免（模糊调用重载函数）

Question

Good morning, I was solving a problem on a different site and i had to make an operation which takes a number, divides it by another and then output an integer no matter what the output is so i made the formula like so:

#include <iostream>
using namespace std;

int main(){
 int n,y=0;
 double x=0.0;
 cin >> n;

if(n%100 == 0){
    y= n%100;
    x+= floor(n/100);
    if(y%20 == 0){
        x += floor(y/20);
        y= y%20;
        if(y%10 == 0){
           x+= floor(y/10);
           y= y%10;
            if(y%5 == 0){
                x += floor(y/5);
                y= y%5;
                if(y%1 == 0)
                x+= floor(y/1);
            }
        }
    }
}
cout >> x;
}

I end up getting the error:

program.cpp(12) : error C2668: 'floor' : ambiguous call to overloaded function

How can i avoid such error when making likewise programs?

Answer 1

You need to include cmath to use the floor function. The cmath library declares a set of functions to compute common mathematical operations and transformations:

#include <cmath>

Source: http://www.cplusplus.com/reference/cmath/floor/

Also, change the bottom line to cout << x;