PAT乙级1016.部分A+B（15 分）

#include<iostream>
#include<cmath>
#include<string>
#include<stdlib.h>
using namespace std;

int count(string s, char a)
{
    int num = 0;
    for (int i = 0; i < s.length(); i++)
    {
        if (s[i] == a)
            num++;
    }
    return num;
}

long P(char a, int num)
{
    long sum = 0;
    while (num--)
    {
        sum += pow(10, num) * (a - ‘0‘);
    }
    return sum;
}
int main()
{
    string A, B;
    char DA, DB;
    int numA, numB;
    long PA, PB;
    cin >> A >> DA >> B >> DB;
    numA = count(A, DA);
    numB = count(B, DB);
    PA = P(DA, numA);
    PB = P(DB, numB);
    cout << PA + PB << endl;
    system("pause");
    return 0;
}