PAT (Basic Level) Practice （中文）1016 部分A+B

#include<stdio.h>

int fun(int A,int n)
{
    int t;
    int l=0;
    int sum=0;
    while(A)
    {
        t=A%10;
        if(t==n)
        {
            sum=sum*10+n;
            l=1;
        }
        A/=10;
    }
    if(l==1)return sum;
    else return 0;
}
int main()
{
    long long a;
    int Da;
    long long b;
    int Db;
    scanf("%lld %d %lld %d",&a,&Da,&b,&Db);
    int Pa=fun(a,Da);
    int Pb=fun(b,Db);
    printf("%d\n",Pa+Pb);
    return 0;
}