pat 乙级 1101 B是A的多少倍

通过字符串和整型的转换实现。

#include <iostream>
#include <math.h>
using namespace std;

int main(){
    string ss;
    int a, b, c = 1, d, e, n;
    cin >> ss >> n;
    a = stoi(ss);
    c = pow(10, n);
    d = a % c;
    e = a / c;
    e += d * pow(10, ss.size() - n);
    double m = (double)e / a;
    printf("%.2f", m);
    return 0;
}