How Many Digits in X to the Power Y

How Many Digits in X to the Power Y.cpp

#include <bits/stdc++.h>

#define MEM(a,b) memset((a),(b),sizeof(a))
#define MAX(a,b) ((a)>(b)?(a):(b))
#define MIn(a,b) ((a)<(b)?(a):(b))
#define MIn4(a,b,c,d) MIn(MIn(MIn(a,b),c),d)
#define In freopen("In.txt", "r", stdin);
#define Out freopen("out.txt", "w", stdout);

#define i64 long long
#define u64 long long unsigned

#define sz 1000000

using namespace std;


//digitsInPower() function returns how many
//Digits we will get in x^y

int digitsInPower(int x,int y)
{
    return (int)(floor((y*1.0)*(log10(x))) + 1);
}

int main()
{
    int x,y;
    while(cin >> x >> y)
        cout << digitsInPower(x,y) << endl;
    return 0;
}